It's time to revise and consolidate all the things learnt on units 8 (4th ESO), 9 (1st, 2nd & 3rd ESO) or 6 (5th primary). Go to www.mac-english.com/mvc and do all the exercises (vocabulary, grammar, reading, listening, video & quiz) on units 6, 8 or 9.
Come on! Make a last effort! And remember, you can redo all the exercises at home to revise for the exam.