Engineering Entrance Exam

No, JEE Mains application form date will not be extended further. But, if you are willing to write you can apply it for the next year that is 2026 1st attempt and 2nd attempt both conducted in January.

Top colleges based on your rank it'll be -

MMMUT - You can get if you have above 90 percentile 

Ajay Kumar Garg - disciplined but good placement private college 

GL Bajaj - Decent college with good placements 

ABES Engineering college - Not so good location but good placements college 

With an 83.98 percentile in JEE Main 2025, you might have to consider less competitive branches or those with a home-state quota. There are no subject-wise marks required in the exam. 

Yes, you can join Rajalakshmi engineering College with JEE percentile as they accept JEE scorecard, and after they take their own interviews and entrance exam. 
The percentile you will required for admission will be around 99 percentile for CS branch. If you want to adopt and if you want to go for ECE or other branch, then 98 or 99 percentile is required.

For All India seats (52%), admissions are based on the rank obtained in the JEE (Main) exam through Institutional counselling.It also depends on your state of domicile but the cutoff of ITNU is so high in each branches either it's CS or Mechanical engineering. 

No, you don't have any chance of getting into ITNU (Institute of Technology, Nirma University) Ahmedabad with a JEE Main rank of 35,000, in any branches.

If you got 78% in JEE mains, the estimated rank in DASA will be more than 8000 according to trends and they are based on JEE Mains actual scores.

You might not get an admission in NIT for CS programme because there is so much difference in DASA rank according to your JEE main percentile. NIT Warangal, Surathkal requires DASA ranks in between 150-400, NIT Calicut requires between 800-1000 and all lower tier NITs requires nearly between 2000-2500. So, it is nearly impossible to get CS in NITs with your JEE 78 percentile.