I would urge you not to stress yourself unless you really need to.
I personally never dedicated more than 5–6 hours a day for learning subjects related to CSE . That is not to say that I have not stretched my study hours when it was required, but a prolonged routine of exertion always led to burn out. Learning is always better done in small periods and small doses. With that word of caution, let me tell you the techniques that worked for me.
Diversification: I never learned a single subject for more than 1 hour. This made sure I was still interested in reading more of the topic. It also kept drudgery at bay. It also meant that I cast a wide net over the syllabus. You are always better off knowing more of different subjects rather than being an expert in one ( as far as the exam is concerned)
Exercise: In my case, I would regularly go to the gym. I had committed to atleast 4 days a week. I had no goal of being shredded or anything, but I made sure that I was physically active. This kept me more alert and energetic
Fun Time: Rather than allotting time for my studies, my timetable was more a syllabus oriented one. I fixed targets that I had to meet and subdivided them to sub targets. As far as I met the target I set for a day, I considered myself a good aspirant. The rest of the day could be spent in anyway I felt like. A movie, hanging out with friends etc.
Discussions on progress with others: I had a group of friends whom I considered were very serious about preparation. I would discuss their progress ( and mine), the study materials they referred, the sites, any new or useful materials or notes, test series etc. We would also discuss current issues or some other topics. Beware! Unless and otherwise you have peers equally good or better than you this will prove counter productive. So unless you have the ability to judge how good your peer is, stay away from group discussions. (Remember the simple principle, water always flows from high ground to low) This doesn’t apply if you are teaching someone.
Talking to your girlfriend: This was my way of staying motivated. We would discuss our future, what we wanted to do once the exam is past us etc. If you have someone who is equally willing to invest in your dream, then you don’t need any of the above actually. In my case I had two people like that. My girl friend ( now wife) and my mother. It also helped that they knew each other.
Finding your own rhythm: I believe everyone has their own internal rhythm as far as preparation is concerned. It is very important that you find it before it is too late. I can’t really tell you what it means, but you have to find it.
I hope this helps. All the best.