Bhaia from my experience protidin er lecture protidin shesh kora, notes kora, plus kono kichu na bujhle facultyr kache giye bujhe newa( faculty ra khubi helpful eshob bepare) egulo onek help kore. But from my personal experience i would suggest you to not focus only on cgpa. Apnar department onujaye Kichu skill develop kore niyen cgpa maintain korar pasha pashi .