Early morning hours (before the sun even rises) are pretty much disturbance-free. Our Messiah would get up around that time to pray
(Mark 1:35). Satan's human vessels aren't disciplined enough to get up around this time it would seem, lol. When I got up and studied around that time (1-5am), I actually did better in my classes. Now I dedicate 5-6 am to studying scripture and I've advanced a lot, with no interruption. I don't know what your schedule is like, but I would highly recommend sacrificing any entertainment/free time until this test is over. Sacrifice whatever you can so you'll be able to go to sleep early and dedicate your study time for early morning sessions. It's a pretty peaceful hour, at least where I live.
As for the stalker: are you provoking any of this behavior by the way you dress? Do you dress modestly or in skin-tight, body-accentuating clothes? These little things make a difference and scripture warns us to dress for modesty not beauty in order to avoid danger or a certain type of attention—whether from angels or men.
(1 Cor 11:1-16, 1 Tim 2:9, 2 Sam 13:1-22)I'll pray for our Heavenly Father to give you wisdom, discernment, and drive—to apply his words & heal your predicaments, and achieve your goals with his help and instruction.