You have scored 120 marks in JEE MAINS, belong to OBC category. You want to join SGSITS Indore - Computer science engineering. You want to explore NIT or DAVV
A. Shir Govindram Seksaria Institute of Technology and Science, is a Governemnt aided Autonomous Institute started in 1952. SGSITS,Indore has 90 seats fpr B.E in Computer Engineering (5 seats under tuition waiver scheme)
The basic criteria is qualifying Class 12, then taking JEE Mains and then go through 3 rounds of counselling. The last level is the college level counselling. There is NO mention of fees/OBC and selection process. You contact them directly (http://www.sgsits.ac.in/contactus)
B.you can also visit the MP government websites or watch out in the major newspapers for announcements
C. IET-DAVV ( Institute of Engineering & Technology,DeveiAhilya Vishwavidyalaya)is approved by UGC and AICTE. The admission is by counselling conducted by DTE, Bhopal or its nodal centres. IET has 120 seats in COmputer Engineering. Admissions are normally done around July/August each year. It would be late for this year, you can contact them later.
This is the PDF which gives the detailed admission process for the year 2017018 . This would help you the understand the process and clear some of your doubts.
Since there is no clear information easily available regarding OBC, you can contact the
Devi Ahilya Vishwavidyalaya, Nalanda Campus,
R. N. T. Marg, Indore (M.P.),India Pin- 452 001