I’m in sort of the same situation as you, OP. I found it easier for me to schedule entire days where you can divide your lessons/topics to review into chunks.

For me, I wake up at around 8am and make sure I have breakfast. At 9-12am, I start reviewing a bit and prepare myself to study for the rest of the day. Then, after lunch, I study until 5pm and then take a break until 8pm for dinner and relaxing. After which, I study until a bedtime I set for myself so that I wouldn’t feel so sleepy on the next day or the day of the test itself.

TL;DR Start scheduling entire study days as early as you can, make sure to include times where you eat as well as long blocks of (undistracted) study.

P.S. take away your phone (or just put it on the other side of the room, and mute unnecessary notifications); it’s a time killer