Hello Greetings

From this year onwards JEE MAIN is conducted by National testing agency therefor the exam is conducted in different shifts,  to avoid any kind of partiality in terms of difficulty the cutoff will not be marks but rather it will be percentile is calculated for different shifts so after both the session of JEE main over that is JEE main January and JEE main April then only the cutoff percentile will be announced so as this is the first time therefore we cannot tell you the exact cut off but  out of 10 lakh students two lakh are going to be selected therefore cutoff percentile should be around 80 percentile.

Hope this helps all the best