How to regain motivation and discipline?

Hey second year student year and I just want some advice or words on how to regain disciplined regarding school. My first year and past two quarters I was on it, studying everyday and caught up and passed all my exams with 92-100%. I’m in my final quarter and despite taking only two classes (fewer than all previous quarters) I feel less motivation and disciplined. I barely study, maybe an hour or two before an exam and I try to finish my homework as fast as possible. I have been doing okay but it’s starting to hit me as my grade has just been getting lower and lower. This is mostly about anatomy and physiology 2 but yeah Im mostly upset at myself since I know I have the free time, I quit my job about a year ago, but its harder to keep up at school compared to when I had one. Maybe I just have too much free time? Im not sure but if this keeps up I will have to retake this class.