Guys I wanna be a scientist and by my exposure JEE is a great exam u must prepare for in High school to deepen in science.
It is the most affordable one and go with practising as much questions as possible and as sooner as possible!!
Don't increase more no. of questions bcs they have enough difficulty and the next years are even easier so should be neglected
Innovation in questions doesn't come so sooner in government exams in India so easily actually
watch this for more.

https://youtu.be/XvZkcjWfgXQ?si=8FLVXENTCjfwBNUG