Hi dear.,

              First tell us which entrance exam you are preparing for. Now you should try to clear your all concepts at coaching institute. Don't study in evening or late night. Eat healthy and sleep early at 9pm. Then wake up at 4am in morning and then give rest to you body by  doing half hour meditation,doing cycling,exercise, walking etc. 

Then revise all the previous day concepts taught in class and do at least half hour practice of the questions/numericals. 

And then 6:30 go to your coaching.