Sir i am targeting NSEA and nsep 2017 what all should i study and how much time should i devote per day and pls advise me refrence books

@ amoolya 
u need to go through the ncert first , ncert forms the besics and 40 percent of the ques in science and astronomy olympiad is ncert based . 
so, after ncert , take past year papers and start practicing . 
and the mtg publication books are best considered for olympiads , 

so, u can follow that . 

GOOD LUCK ..