Hello Aspirant
As per Jee main Elligiblity criteria you are not elligible if you are from cbse board .
Minimum 75 % marks is required in 12th for cbse board for general and obc category . If you are in other board then you should check the top 20 percentile of that board which is declared by josaa counseling .
Thanks

Dear Aspirant,

With your current marks you will not be able to get into NITs or IITs as you have to be in top 20 percentile of your boards. If you are from CBSE then you have to score 75% marks.

However, here is what you can do. You can appear for improvement and prepare again for JEE 2020. Try to score above 75% marks. 

Check out the process to apply for the improvement on the CBSE official website.

Hope this helps.

Thank you.