Science can be your most favorite subject if you're able to understand concepts well and at the same time, it can turn out to be the worst subject otherwise. Love it or hate it, it's going to add up marks to your total marks and you have to score well in Science. Getting good score in science is not at all a hard thing to do if you know tips and tricks!
1) Practice the diagrams well
Diagrams are a sure shot question in your exam. Be fully prepared with all the diagrams you've got in physics, chemistry or biology. This will certainly add some good marks to your total marks in science. Practice it on a regular basis with the labeling and not just the graphical diagrams.
2) Write down all formulae in a sheet of paper
Make a list of all science formulae and write it down in a sheet of paper in your best handwriting. Stick this paper onto one of your walls next to your bed. Run a check through these formulae whenever you glance at your wall. This will help you in remembering these formulae for life. Trust me on that!
3) Get your concepts accurate!
Learn all your science concepts well and take time to have a deep understanding of these concepts to the extent it's been explained in your CBSE class 9 science books. Get help from anyone who know these concepts well. It can be your teachers or friends or siblings or your neighborhood uncle. Your goal is to strictly learn all the concepts well!
4) Learn all the "Laws"
There are a couple of "Scientific Laws" in CBSE class 9 science book that needs to be learnt. Understanding alone won't help here. You must be able to write them with exact words to score full marks in the exam.
5) Practice science sums
There are hardly some problems in science, unlike maths. Learn them and practice them thoroughly to score good marks. At least 3 problems are sure to be asked in your exams, so go prepared!