Hello Aspirant,
Since you have not mentioned your category so considering it as General.
As we go through the latest cut-offs of JEE-Advance 2020 of JOSAA 6th round then it shows that :-
Closing AIR for IIT Madras was :-
So with regards to JEEE-Advance 2021 you should try to secure your All India Rank under 7900 to be on the safer side and it is quite difficult to tell you about exact marks to score because for JEE-Advance no maximum marks are fixed.
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 marks, category, and state you can use JEE-Main College Predictor:-
https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer
If you are preparing for JEE-Main 2021 or 2022 then 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 or 2022 :-
https://learn.careers360.com/jee-main-coaching/?utm_source=%20QnA
You can also check out the JEE-Main 2021 qualifying cut-off (expected) for JEE-Advance 2021 from the link given below :-
https://engineering.careers360.com/articles/jee-main-cutoff
I hope this information helps you.
Good Luck!!
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