Level 1 prep with no dedicated

About 2ish months out from level 1 but unsure how to structure my studying/schedule. There is no true dedicated period at my school. We have 3 weeks of normal curriculum left then a systems review course during April that requires minimum 3-5 hours of on campus attendance daily with weekly shelf exams. We are expected to hit a 500 COMSAE the first week of May in order to take Level 1 prior to the start of rotations on June 1. Feeling overwhelmed and would appreciate any advise!