You can easily score well in your 9th standard by following some tricks:
Knowing the concepts clearly: You must have the clarity of all the concepts in your syllabus.
Regular practice: Practise all the concepts and formulas regularly to get good command over the toughest subjects.
Make notes & read it thoroughly: Taking notes is always helpful to memorise the complete syllabus.
Regular revision: Regular revision helps you to remember the key points of your subjects.
Time management: Divide your time according to the needs of the subjects.