Help with schedule to study

Hey,
I really need some help with a decent study schedule. I have time till the first week of october from now. I have two subjects to be studying, although one I am fine at, it would be good if I could make time for it and study every day. So far the only consistent thing for me daily is sleep, study at random times and not efficiently, and walking 3hrs a day at night before sleeping since I have really bad sleep issues. I wont talk of it. But I need a schedule to follow, to study both the subject, and use my day after I wake up and focus on it all. I notice that in one go, i can last for 1-2 hrs and then I dont feel like studting again for a period of time. I want to be able to do great and study well till its the time for exam and atleast manage to pass. Besides the 3hrs walking, i have the rest all for day. I usually sleep 4-8 hours at most, usually low and very rarely 7-8.