NIT

Yes, definitely you can pursue Masters in Technology M.Tech in Data Science from Indian Institute of Technology IITs and National Institute of Technology NITs through Graduate Aptitude Test in Engineering GATE because both the institutions accepts GATE entrance exam scores primarily for admission to MTech. There are some other colleges in Delhi who offers M.Tech course through Gate scores like Delhi Technological University DTU, Amity University Noida, Netaji Subhas University of Technology NSUT, Indraprastha Institution of Information Technology IIIT Delhi.

Yes, you can get some NIT which are situated near Uttar Pradesh which have low cutoff ranks including NIT Patna, NIT Allahabad and NIt Bhopal. You may be able to get branches like Civil Engineering, Mechanical Engineering and Electrical Engineering in NIT Patna or NIT Allahabad.

If you got 98.8 percentile in JEE Mains exam then it is considered as most best score 

The possible NIT names are given as following 

1 MNIT Allahabad 

2 VINIT Nagpur 

3 NIT Surathkal 

4 NIT Rourkela 

5 NIT Trichy 

With JEE Main CRL rank 99500 and OBC-NCL rank 33000, consider:

- *NITs:* NIT Patna, NIT Jamshedpur, NIT Allahabad, NIT Bhopal, NIT Calicut

- *Branches:* Electronics, Electrical, Mechanical Engineering

- *Next Steps:* Check JoSAA website for cutoff ranks and participate in counseling for seat allocation.

You might not get good NIT colleges and also good branch in NIT, you might have to take lower NIT and the branches will be like civil, chemical, environmental engineering

While for IIIT, you can try for IIIT Nagpur with lower branch, also, you can try. IIIT Ranchi.