Hello aspirant,

I hope that you are doing absolutely great.

With reference to your above mentioned query, I would like to tell you that you do not need to worry about the early preparation for JEE/neet, since you are in class 10th.

JEE/NEET preparation can also be done in classes 11th and 12th as two years is more than enough for the preparation for these competitive exams and  scoring good and brilliant results in these exam as well. So, I will recommend you to focus on your ntse exam since it is near and don't worry too much about JEE or NEET exams.

Also, since you're a JEE and NEET aspirant, check out the knockout packages to boost your exam preparation and score good results in these competitive exams. Follow the below mentioned link :

https://learn.careers360.com/knockout-jee-main-neet/

I hope that this will help.