JEE

To get admission in any college through JEE Mains, 75% is required in 12th boards, which you have not. There are some good colleges which do not have 75% criteria like IIIT Hyderabad, BITS PILANI (with good BITSAT score), VJTI MUMBAI etc., but these colleges demand a good score in JEE Mains. From my side, I would suggest that you try for a minimum of 85+ percentile score in the second attempt and get admission in a good state government college. If you can spend INR 15 to 20 lacs in 4 years, then you can also go to a good private college. Try to get a college in the city area where you can get exposure.

For B.Tech Computer Science at Jaipur Engineering College & Research Centre (JECRC), the expected JEE Main EWS cutoff percentile ranges between 85 to 89.9 for merit scholarships, and above 90 for higher merit scholarships. 

JEE Main Percentile for Merit Scholarships:

• 85 to 89.9: Merit Scholarship 
• Above 90: Merit Scholarship 

Joining Indian Institute of Space Science and Technology (IIST), Thiruvananthapuram with a high percentile in JEE Main is the only way, looking at its competitiveness. General category cutoffs in 2024 hovered between 92-95, while for OBCs, it was around 85-90 and for SC/ST categories, it were around 70-75, on the basis of JEE Main ranks feeding into JEE Advanced eligibility.

Then, IIST uses Advanced ranks (top 20 percentile or 75% in 12th PCM) for final admission.  cut-offs may increase a little with an increase in demand, advising rank under 10,000 in Main. Accurate figures post-exam can be found at iist.ac.in. 

Yes, there is a good chance of getting admission in Jaypee Institute of Information Technology  (JIIT) for B.Tech CSE with 90% in UP Board and 70% in JEE Mains.

CSE is a competitive branch, and JIIT Noida considers JEE mains scores for admission, but there is a difference in cutoffs every year.

As 97.8 is good ranking for CSE branch colleges like IITs ( Kottayam, Siri city, una), NITs, (Kottayam, nagaland, uttarakhand) can get also notable University brirla institute of technology, institute of infrastructure technology, research and management, ahmadabad also better option as their privious close rank was also around it 

Your books provide a strong foundation, but for JEE Mains, you need more problem-solving practice. Add HC Verma (Physics), Arihant/Cengage (Maths), and P. Bahadur (Physical Chemistry), along with mock tests for better preparation.

Prospective students of the B.Tech Computer Science and Engineering program at Kalyani Government Engineering College (KGEC) need to seek admission through their WBJEE ranks rather than JEE Main. The admission chances through WBJEE at position 3599 as an OBC candidate depend on previous year cut-off pattern data. OBC candidates at KGEC normally need to match the cutoff between 1500 and 2500 for CSE admission. The likelihood of securing CSE admission at Kalyani Government Engineering College is minimal but you could secure a less popular branch. Verify the most current cutoff information to remain certain.

Students with a JEE Mains B.Arch CRL rank of 2200 and a home state quota in Madhya Pradesh have a good chance of obtaining admission to B.Arch programs run by NITs. The admission at NIT Bhopal depends on the category-wise cutoff differences since the cutoff rank for this institution could be higher than other NITs. Your placement in B.Arch NITs is possible through NIT Hamirpur or NIT Patna because their closing ranks stand higher than several other NITs. .