補習

补习
bǔxí
to take extra lessons in a cram school or with a private tutor

CEDICT

Entry Composition

1 補 bǔ
  1. to repair
  2. to patch
  3. to mend
  4. to make up for
  5. to fill (a vacancy)
  6. to supplement
2 習 xí
  1. (bound form) to practice
  2. to study
  3. habit
  4. custom