anyone else have this all or nothing problem? tips? 🥹

so my biggest problem with studying is that I will randomly get a burst of motivation then study every day for 4.5 hours and feel so good then suddenly all my energy is gone and I can't even do 10 minutes of studying. I'm currently stuck in the second half of this cycle and i feel so guilty because my exams are in November and I'm probably going to fail them even with studying.

any tips?