Hello Aspirant,
See in the wake of COVID-19 the Education ministry and Joint Admission Board jointly decided that as of previous year, this year also the 75% relaxation criteria will be provided for admission to IITs through JEE-Advance which means if the candidate is passed in his/her class 12th then also he/she can appear for JEE-Advance and can get admission to IITs, there is no any compulsion for him/her to secure either 75% in boards or be in top 20 percentile of his/her respective board results. But this relaxation is only provided for admission to IITs through JEE-Advance but not for NITs/IIITs/CFTIs through JEE-Main so if you want to get admission in any of the NITs/IIITs/CFTIs through JEE-Main then it is mandatory to have either 75% in your class 12th if you belongs to General/Unreserved category and 65% if you belongs to any of the reserved category or be in top 20 percentile for your respective board's result. And as you have mentioned that you have secured only 61.23% in your Higher Secondary/class 12th exams so you are not eligible for admission to NITs/IIITs/CFTIs through JEE-Main but yes you can appear for JEE-Main and if you qualify it you can appear for JEE-Advance and can get admission to any of the IITs depending upon your rank in JEE-Advance.
For complete details about JEE-Advance and JEE-Main kindly check out the link given below :-
https://engineering.careers360.com/exams/jee-advanced
https://engineering.careers360.com/exams/jee-main
I hope this information helps you.
Good Luck!!
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