What the A1 exam actually tests
The ASE A1 Engine Repair test has roughly 50 scored questions plus about 10 unscored research items you will not know are research items. You have 75 minutes, which sounds generous until you meet the case-study stems. Roughly 40% of the test is diagnosis, 25% is cylinder-head and valvetrain, 20% is engine block, and the balance is lubrication, cooling, and fuel/air/exhaust support systems.
Nothing on the test is trivia. Every question is written to look like a shop ticket: a symptom, a measurement, and a fork in the road. If you have never actually measured a cylinder for taper or watched a timing mark drift, that shows immediately.
The two-week study plan that works
Week one is content. Read one A1 chapter per night and turn every subheading into a flashcard prompt. TORQUE_OS ships an A1 deck with the specs you will actually be asked about, plus a 28-question quiz that mirrors ASE stem style.
Week two is exam simulation. Run the full quiz cold, mark every miss, then rebuild flashcards only from the misses. Repeat every 48 hours. Cards you already know are wasted study time — spaced repetition exists precisely so you stop reviewing them.
The specs worth memorizing cold
Cylinder taper limit for most passenger engines is 0.005 inch. Cylinder out-of-round limit is 0.003 inch. Both are measured with a bore gauge across three depths and two axes.
Valve stem-to-guide clearance is typically 0.001-0.003 inch on intake, 0.002-0.004 inch on exhaust. A stem that walks in the guide will smoke on cold start and pass the exhaust valve stem test in about 30 seconds of test-drive.
Compression variation between cylinders should stay within 10% of the highest cylinder. A cylinder more than 25 psi low from its neighbor is either a valve issue (dry wet test) or ring wear (compression rises significantly with a wet test).
The trap ASE loves
Technician A / Technician B stems are engineered so the tempting answer is always 'both.' Read every stem twice: one technician is usually applying a real procedure to the wrong symptom. When you see 'both are correct' as the obvious pick, slow down.