Hello Aspirant,
As we go through the latest cut-off of 2020 then it shows that the closing OBC rank was 8841 for CSE branch in IIIT Vadodara for OBC category. Now to secure such rank you should have your JEE-Main score at least 120-130 marks out of 300 and percentile against this is expected to be in the range of 97.8112608696124 - 98.2541321080562 .
You can check out marks Vs ranks Vs Percentile from the link given below :-
https://engineering.careers360.com/articles/jee-main-marks-vs-percentile
Or
You can also use JEE-Main Rank Predictor to predict your rank :-
JEE Main Rank Predictor - Know your expected IIT JEE Main 2021 Rank by ...
You can check out the latest cut-offs from the link given below :-
https://josaa.nic.in/Result/Result/currentorcr.aspx
Note that the above prediction is made on the basis of latest cut-offs available on official website of JOSAA or CSAB and the cut-offs are bound to change every year depending upon various factors such as the number of candidates appearing in an examination, the number of candidates qualifying an examination, difficulty level of the paper, and so on.
To have a list of all those colleges which you can get based upon your score, category, and state you can use JEE-Main College Predictor :-
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer
As you are preparing for JEE-Main 2021 the I would recommend you to check the resources made by our experts to help aspirants like you in the best and smart preparation of JEE-Main 2021 :-
https://learn.careers360.com/jee-main-coaching/?utm_source=%20QnA
I hope this information helps you.
Good Luck!!
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