Hello Aspirant,
As we go through the latest cut-offs of 6th round of JOSAA counselling 2020 then it shows that the closing rank for Open/General category was 8247 for Agricultural and Food Engineering branch in IIT Bombay.
As you are asking for marks to be secured in JEE-Advance for IIT Kharagpur so let me tell you that for JEE-Advance no maximum marks are fixed therefore it is quite difficult to tell you about exact marks to score but yes with regards to JEE-Advance 2021 if you secure your AIR in JEE-Advance under top 8200 then there would be good chances for you to get into IIT Bombay. Now note that this cut-off prediction is only for Agricultural and Food Engineering branch because it has minimum cut-off for other branches this will vary so you can check it out from the official site of JOSAA as 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 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 JEE-Main 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 or JEE-Advance 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 or JEE-Advance 2021 :-
https://learn.careers360.com/jee-main-coaching/?utm_source=%20QnA
I hope this information helps you.
Good Luck!!
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