Well not sure about all the colleges in India but definitely colleges such as NITs, IITS or IIITs don't offer free admissions. It depends upon the JEE Main and JEE Advance cut offs, If You manage to qualify the exam by achieving the cut off, You can apply for JOSAA Counselling. It should be noted the cut off for EWS/ SC/ ST/ OBC category is lower than the general category
However It is usually advised to fill the choices as per the preference of colleges and departments, for example CSE in NIT Trichy is your priority followed by CSE in NIT Warangal, you can fill CSE at NIT Trichy at serial number 1 and CSE at NIT Warangal at serial number 2 and so on and so forth. However to get any NIT, you must have qualified JEE Mains and to get any IIT, you must have qualifies JEE Advanced

But the previous cut offs of colleges should be taken in consideration, it is better to research over the cut off of colleges then make a preference list of colleges and fill accordingly

For the college preferences and the courses provided by these colleges and to know which colleges participate in the JOSAA counselling, please go to the below mentioned link: https://engineering.careers360.com/articles/josaa-participating-institutes/amp

According to your rank, it will be difficult to get a free seat or a seat in NIT/IIIT/GFTI . Although you may try for private engineering colleges accepting jee mains score.

Check out the link below to explore top private colleges in India.

https://engineering.careers360.com/colleges/list-of-private-engineering-colleges-in-india-accepting-jee-main

Some universities like VIT, SRM, PES conduct their own entrance exams too. If you have appeared in them, then you have chances for getting scholarships. But free seat is difficult to get.

Good Luck !

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