Chem/Phys · Coulomb’s law · no signup

One mistake, four moves.

Most prep shows you the answer and moves on. Here you answer one question, then work on the exact step that tripped you, the way every miss works in the Red Pen Prep course.

  1. Answer one MCAT-style question
  2. Isolate the one variable behind a miss
  3. Make it right change the problem so another answer is correct
  4. New case a fresh question on the same step