Hello Aspirant

There is no minimum Percentage required for JEE mains registration and appearing for the exam. However, for applying to IITs, NITs, and IIITs, you need a minimum percentage of 75% for the general category and 65% for the SC/ST categories. Since you have 59%, you are not eligible to get into IIITs.

However, GFITs do not have such criteria for admission, they do not consider 12th Board percentages so you can consider applying to them because they only look into your JEE score.

Hope this helps