You know the feeling. The textbook is open. The clock is moving. Nothing is clicking. This is that story.
You open your AP Chem homework. Balancing equations. You remember doing this in class. Kind of.
You've erased the same line four times. The coefficients don't balance. Your parent leans over: "Is it like algebra?" It is not like algebra.
You Google it. The first result has a formula with subscripts you don't recognize. The YouTube video is 47 minutes long.
Your parent has pulled out their own high school notes. They're from 1994. Avogadro's number is spelled wrong.
This is our busiest hour. Not because students give up — because this is exactly when they need someone to sit down and say: okay, here's what's actually happening.
That moment of relief — that's what we build every session around.
See how it worksEvery student enters at their crisis point. The hub-and-spoke model means you can start at Diagnosis, jump to Exam Prep, or work through all four.
Five real homework-style questions identify whether you're stuck on nomenclature, mole conversions, bonding, or acid-base chemistry — not a self-reported survey.
We match you with a specialist in your exact weak topic — not a generalist. Your first session starts from your diagnostic result, not from scratch.
Tiered problem sets that start at your level and scale up. Each problem mirrors your actual homework format — same notation, same complexity.
AP exam and final exam prep built around your specific course syllabus. We know what College Board tests. We know what your professor emphasizes.
No account needed. Results in 4 minutes.
We didn't build generic chemistry help. We studied 47,000+ student sessions and found the six topics that account for 78% of failing grades.
Hover any card to interact with the molecular diagram.
ΔG = ΔH − TΔSSN1 · SN2 · E1 · E2Keq · Le Chatelier · ICE tablesElectron geometry · Molecular shapeMole ratios · Limiting reagents · YieldpH · Ka · Buffer systemsEvery story below comes from a student who found their exact gap and fixed it. Parents tell their side too — because they were at the table.
"I failed the mole conversion unit twice. My tutor showed me the railroad track method and I did 20 practice problems that night. I got a 91 on the retake."
"I couldn't help her — I never took AP Chem. What I needed was someone to sit with her at 11 PM and explain it like a person. That's exactly what happened."
"I was retaking Gen Chem after failing it the first semester. The diagnostic told me my actual problem was weak acid calculations, not equilibrium. That changed everything."
"He called me at midnight after his first session. He said "Mom, I finally understand what Ka means." I cried. That's not an exaggeration."
"I understood most of chem but thermodynamics was a black box. Two sessions on entropy and Gibbs free energy and it clicked. I scored a 5 on the AP exam."
"As a parent you want to help but you can't. What Catalyst gave us was a specialist who knew exactly where Sofia was stuck — not guessing, not generic tutoring."
Five real chemistry problems — the kind you'd find on an AP Chem or Gen Chem exam. No self-assessment, no guessing. We'll show you exactly where the gap is.