20 multiple-choice questions in College Board exam style. Each has four choices and a full explanation of why each option is right or wrong.
Watch the direction of the trend. "Across a period" and "down a group" produce opposite results for radius, ionization energy, and electronegativity — read carefully before answering.
On PES questions, check the axis. Binding energy decreases left to right on most AP Chem PES graphs — don't assume the highest peak is always the outermost electron.
Mole problems are unit conversions. Track grams → moles → particles (or the reverse) with dimensional analysis, and the math takes care of itself.
Read the explanations even when you got it right. Each one teaches a small fact that often returns in a different form on the exam.