How do I score good marks in science class 9?

Science is a practical and theoretical knowledge.when you will be able to correlate all your books concept with your surroundings object then there will be not necessary to muggup all formula and concept.and will be strong in those sections automatically Your marks will be improve

Just improve your concepts do revise & practice concepts with practical examples daily.

Science explains the things which we observe in day to day life. If you study this subject in fun learning way with your interest then,  your score will automatically improve.