It depends on which Course You are Interested Because High Demanding courses require very good rank. There are Five Months in Your Hand You can get a good rank. There are few things Which You should do while Preparing for JEE to get a good rank, whenever You study Your whole focus should be in it and Try to solve Previous years Questions to get an Idea of How the questions are Being asked so that it will be helpful while Preparing and sorting out the relevant questions, So make sure Not to go away from the syllabus.

Marks vary every year so we can not tell You the exact marks, However, there is a pattern in the closing ranks which You can see at JoSAA and find the closing rank of the course in which You are interested.

https://josaa.nic.in/webinfocms/Public/View.aspx?page=71