Hello Ashutotosh,

   I am afraid to tell you that you are not eligible to apply for any NIT IIT or IIITS or GFTIs as the minimum criteria to attend the councelling is 75 percent, FOR GENERAL AND 65 PERCENT FOR RESERVED CATAGORIES in your CBSE board or equialent percentile in any other board.You also need to pass in all the subjects in your boards in order to attend the JEE councelling.

However if you wait, the JEE also conducts a Round for SFTIs or self funded institutions. They dont have such hard rules for the councelling. You can get admisson in ine of them . 

If not, you always hae options for private engineering colleges, and the rest is upon your potential. You can exell in your life and career even by studying from a private college.

All the best and hope for the same

Hope it helps

THAKYOU