first of all, I would suggest you focus on your curriculum first. brush up your concepts from the starting. you will enter a new stage in class 9 so focus on every topic of mathematics and physics. you can join various institutes that offer the preparation for competitive exams in class 9 and continue further. you will get ample time to prepare for the exam, you can focus on your curriculum on weekdays and jee preparation on the weekends. When you have enough time for preparation, you can revise and practice regularly. you will gain a lot of knowledge.

so all the very best !!!!!!. I wish you clear jee with rank 1.

study hard.