Hello student ,

Yes , it is easy to score 300 marks in biology as it is the most scoring subject for the examination .In examination most of the questions comes as it is they are so for these questions you can answer them easily . Beside this for others questions you have to go through your books and notes and then try to generate questions from that and try to answers that by yourself after that try to divide chapters which you think you know very less about that and do read it more and practice figures as much as you can .Then try to solve sample papers and then solve mtg fingertips which will surely help you score 300 marks in examination.

Hope it helps !

Good luck !