Practice and repetition are the keys to the mastery of foreign language skills. This statement is true of pronunciation as well as sentence structure and of oral as well as written drills. The desired skills are developed little by little, day by day. Consistent study habits are essential to the acquisition of language skills.
Daily study is preferable to intermittent cramming.
If you want to do well in French at this level, never miss a class. Make a real effort to give complete attention to work throughout the class period. Try to answer, subvocally, every question the instructor asks. Master every detail of each lesson as you go along. Keep a notebook as reference for grammatical notes as well as for new vocabulary.