IIT

Based on the search results, with a CRL rank of 475749 and OBC PWD category, it is unlikely that you will be able to secure admission to the top-ranked NITs or IITs for B.Tech. However, you can consider NITs that have a lower cut-off rank for your category. Some of the NITs that you can consider are NIT Rourkela, NIT Durgapur, NIT Warangal, NIT Trichy, etc.

Unfortunately with your rank and category you do not have chances of getting any IITs. I will suggest you to sit for JoSAA counselling with your JEE Main score, that might fetch you good NITs and IIITs.

You got a very good rank in SC category. Congratulations for that.

According to the last year cut off. Here I'm listing some IITs in which you have chances to get a seat.

Indian Institute of Technology, Bhubaneswar

Indian Institute of Technology, Indore

Indian Institute of Technology, Mandi

Indian Institute of Technology, Kharagpur

Indian Institute of Technology, Hyderabad

You are ST and your rank in JEE advanced is very good. You will get a seat in best IIT's .

SC and ST students having more possibilities to get . 

Yes, it is good enough to prepare. You have to work hard and practice a lot for it. You have to focus equally in all three subjects and also revised

IIT Bombay (CSE/ECE): IIT Bombay is one of the most prestigious IITs and is known for its strong computerScienceand electrical engineering programs. With your rank, you have a good chance of getting admission to CSE or ECE at IIT Bombay

Preparatory SC rank 1220 is a relatively good rank, and it increases your chances of getting admission to an IIT through the preparatory course. However, the availability of seats and the final admissions process can vary each year. It is recommended to check the official websites of the IITs and their previous year's cutoff ranks to get a better understanding of your chances for admission.