Free · built by students, for students
Parksule Tutoring
A better way to figure out what you don’t know.
Most studying goes wrong in the same place: you re-read what you already understand and never find the thing that’s actually broken. Parksule finds it, explains that specific thing, and gives you questions aimed at it. When you want a person instead, the tutoring is free.
No payment details, ever. Takes about a minute to set up.
Diagnostic results
Example
- Describing distributionsProficient88%
- Center and spreadProficient71%
- Sampling methodsDeveloping54%
- Experimental designNeeds Work32%
Recommended next
Experimental design — 20 minutes. It’s your weakest skill and Unit 1 leans on it heavily.
How it works
Five steps, in this order, every time
Each step answers a question you'd otherwise have to guess at: what am I doing, why am I doing it, and what should I do next.
Diagnose
A short diagnostic that isn't graded out of ten. It reports skill by skill: this one is solid, this one is shaky, this one you haven't got yet.
Learn
A plain explanation of the specific idea you missed — not a chapter, not a video you have to scrub through. The one idea.
Practice
Questions chosen for you. If you keep making a particular mistake, you get the questions built to catch that exact mistake.
Improve
Your mastery moves as your answers change. Old mistakes stop counting against you once you can actually do it.
Get help
When software isn't enough, book a free session with one of our tutors. They see what you've been working on before you arrive.
Learn independently
The whole thing works at 2am
Nothing here waits on a tutor being awake. If nobody does anything on a given day, Parksule still knows what you should study and why.
- Diagnostics that name the skill
- You don't get 8/10. You get: Center and Spread — solid. Sampling Methods — shaky. Experimental Design — not yet. That's the difference between knowing your score and knowing what to do on Tuesday.
- Practice that follows your mistakes
- Every wrong answer is attached to a specific misunderstanding, written down in advance. Confuse random selection with random assignment twice and Parksule starts feeding you the questions built to separate them.
- Hints before answers
- Stuck on a question? You get a conceptual nudge first, then a narrowing hint, then the method. The answer stays hidden until you've had a real chance at it.
- Study plans with actual days on them
- Tell it your test date and how long you can study. You get a day-by-day plan that puts your weakest material first and leaves room at the end for a practice test and repairs.
Today’s session
20 minutes · Sampling Methods
- 3 min
Quick review
2 questions from what you did last time
- 4 min
Learn
Random selection vs. random assignment
- 6 min
Practice
3 questions targeting that distinction
- 3 min
Explain
Say why your answer works, in your own words
- 4 min
Challenge
One harder question that applies it
Example of the session format. Yours is built from your own mastery scores.
Get human help
Free tutoring with a real person
Some things don’t come apart on their own. Pick a tutor, pick a time they actually have free, and say what you’re stuck on. There is no cost, no package, and no card on file.
The part that makes this different: when you book, your tutor already sees your mastery on the relevant skills, the misconception you keep hitting, and the questions you got wrong this week. Nobody spends the first fifteen minutes working out where you are.
See available timesWhat your tutor sees before the session
- Struggling with
- Sampling Methods · Experimental Design
- Current mastery
- Sampling Methods — 54%
- Recent misconception
- Confuses random selection with random assignment
- Recent work
- 8 attempts · 62% accuracy
Example of the summary format. Your own data appears here once you’ve practiced.
Course library
Small on purpose
A course is only listed once its questions have explanations, hints and misconception tags. Half-finished courses waste your time, so they don't go up.
Mathematics
AP Statistics
Exploring data, collecting data, probability, and the four families of statistical inference. All nine units.
9 units · 17 topics
Mathematics
AP Precalculus
Polynomial and rational functions, exponentials and logarithms, and trigonometry — the function toolkit calculus is built on.
4 units · 9 topics
Mathematics
AP Calculus AB
Limits, derivatives, integrals and their applications — the first year of calculus, covering Units 1 to 8.
8 units · 8 topics
Mathematics
AP Calculus BC
Everything in Calculus AB plus parametric, polar and vector functions and infinite series — Units 1 to 10.
10 units · 10 topics
Computer Science
Python Programming
From your first program to code someone else can maintain: types and names, control flow, collections, functions, exceptions, files, classes, and the testing and complexity habits that make the difference professionally.
7 units · 13 topics
Computer Science
Java Programming
Static types, objects, and the discipline that comes with them: the type system, classes and encapsulation, equals and hashCode, interfaces and polymorphism, collections and generics, exceptions, and the testing habits Java teams expect.
6 units · 11 topics
Science
AP Physics 1
Algebra-based physics across all eight units: kinematics, forces, energy, momentum, rotation, oscillations and fluids — taught through free-body diagrams and conservation laws rather than equation-hunting.
8 units · 13 topics
Science
AP Physics C: Mechanics
Calculus-based mechanics across all seven units: kinematics, dynamics, energy, momentum, rotation and oscillations — with the derivations behind the equations Physics 1 asks you to memorize.
7 units · 8 topics
Science
AP Physics C: Electricity and Magnetism
Calculus-based electricity and magnetism across all six units: fields and Gauss's law, potential, capacitors, circuits, magnetism and induction — with the field-versus-force distinction treated as the central idea it is.
6 units · 6 topics
World Languages
AP Spanish Language and Culture
The full AP Spanish Language and Culture course: the grammar needed to produce accurate Spanish, the three modes of communication the exam is built on, and the six themes with the vocabulary and cultural knowledge each one draws on.
5 units · 9 topics
Mathematics
Multivariable Calculus
A full semester of multivariable calculus: vectors and the geometry of space, vector-valued functions, partial derivatives and optimization, multiple integrals, and vector calculus through Green's, Stokes' and the divergence theorems.
5 units · 6 topics
Mathematics
Linear Algebra
A full first course in linear algebra: linear systems and row reduction, span and independence, matrices as transformations, determinants, vector spaces, eigenvalues and diagonalization, and orthogonality through least squares.
7 units · 7 topics
Computer Science
C++ Programming
C++ organized around object lifetime and ownership, across six units: the build model, value semantics and references, pointers and const, classes with the rule of five and move semantics, RAII and smart pointers, templates and the standard library, and undefined behavior.
6 units · 7 topics
Science
Quantum Mechanics
A full first course in quantum mechanics: the experiments that forced it, states and measurement, the Schrödinger equation with the infinite well, harmonic oscillator and tunneling, the operator formalism, spin and atoms, and entanglement and qubits — with the popular misconceptions dismantled along the way.
6 units · 8 topics
1338 questions in the bank, each with a written explanation.
For teachers
Classroom features, honestly labeled
Here is exactly what works today and what doesn't.
Working now
- Classes with a join code
- Class mastery by skill, and the weakest skills
- The class’s most common mistakes
- Homework and review assignments with due dates
- Appointing Parksule tutors to a class
Not built yet
- Assigning a diagnostic to a class
- Exporting a gradebook
- Syncing with school rosters
A teacher sees the progress of students who joined their class with its code, and nobody else’s. Students never see each other’s work. Teacher accounts are set up by Parksule — email us from your school address.
FAQ
Reasonable questions
- Is this actually free?
- Yes — the practice platform and the tutoring both. There is no payment page anywhere in this site, no plan to add one, and no upsell at the end of a session. Om and Jaden built this to get better at software and teaching, and tutoring people is how you get better at teaching. Nobody who tutors here is paid, including them.
- Who are the tutors?
- Students who tutor in the subjects they have actually taken. Om Palsule and Jaden Park built Parksule and tutor on it; anyone else has applied and been approved by one of them, and every tutor lists the specific subjects they can help with. None of them are certified teachers and none claim to be. If you need something outside what a tutor knows, they will say so rather than wing it.
- Does Parksule use AI to teach me?
- No. Every explanation, hint and wrong-answer diagnosis on this site was written by a person and stored in the question bank. When you pick a wrong answer, Parksule knows which misunderstanding that particular answer comes from because someone wrote that down ahead of time. Nothing is generated while you wait, and there's no chatbot.
- What does a mastery score actually mean?
- It is not your percent correct. It weighs recent answers more heavily than old ones, counts a hard question for more than an easy one, gives partial credit when you needed hints, and stays cautious until you've answered enough questions to have proven anything. That's why it doesn't jump to 100% after one right answer.
- What if I only have ten minutes?
- Use the 5-Minute Rescue. Pick a topic, answer a few questions to find where it breaks down, read one short explanation, do three targeted questions, and get a straight answer about whether you're ready to move on.
- What subjects can I study?
- AP Statistics, AP Precalculus, AP Calculus AB, AP Calculus BC, Python Programming, Java Programming, AP Physics 1, AP Physics C: Mechanics, AP Physics C: Electricity and Magnetism, AP Spanish Language and Culture, Multivariable Calculus, Linear Algebra, C++ Programming and Quantum Mechanics across Mathematics and Computer Science and Science and World Languages. That is 1338 questions, every one written by hand with its own explanation, three hints and a diagnosis for each wrong answer. Courses are added when they are genuinely finished, not when they are announced.
- Do I have to book tutoring to use this?
- No. The whole platform works on its own, at 2am, without anyone else being awake. Tutoring is there when you want a person.
- What do you do with my data?
- Parksule stores your name, email, grade, courses and your answers — because the answers are what make the practice adaptive. It doesn't sell anything, doesn't run ads, and doesn't ask for a phone number, an address or a birthdate. Accounts are for students 13 and over.
Start with the diagnostic
Fifteen minutes, and you’ll know which skills are solid and which one to fix first.