When you are preparing for subjects, take 2 subjects at a time (one difficult and one easy). First start with your difficult subject and spend as much time as you can. So, when you feel you are stressed out, take a break for 5 to 10 minutes and immediately switch over to easy subject. This way you can spend more time on your preparation by keeping your concentration levels in tact for a longer time. You can finish more subjects in a lesser time.
Spend atleast 2 to 3 hours in the morning. Because, mornings are the best times, where your mind can concentrate better . What i mean is if you spend time on your preparation during this period, then you can cover more in less time. You can spend ideally from 5am to 7am like that.
Follow your schedule regularly. And whenever you think that your motivational level is decreasing, then just relax and do whatever you love. For example, if you are intersted to play any outdoor games, just go and play for sometime. If you want to go out with your friends, just go and have some fun. So, what I mean here is do something which makes you refreshed/enjoy. If you don't like doing any of these things, please watch inspirational videos. I suggest you to watch NICK VUJICIC IN YOUTUBE.
I feel that im very blessed to have all parts in place and i have to make use of God's gift that is bestowed on me . When a person like nick is succesful, then why can't I be successful.This generates more passsion and double my energy to work and do more and more.
I hope this way you can success in your life.