Surely he can apply for JEE advanced 2021. The cutoff for general category this year is 87.89. This makes him eligible for applying for JEE advanced 2021.
He can refer the link for the category-wise cut off of this year for JEE Mains.
https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-cutoff/amp

Also use the college predictor tool to know about the colleges he can get with the score he had got in Jee Mains 2021.
https://engineering.careers360.com/jee-main-college-predictor?utm_source=qna&utm_medium=jee_cp

Hello Sir/Mam,

As the cut-offs are released along with the JEE-Main 2021 result so now it is clear that at what percentile the candidate is eligible for JEE-Advance 2021. As per the NTA, qualifying cut-offs goes like :-

==>> Common Rank List (CRL) - 87.8992241-100.0000000 Percentile

==>> GEN-EWS - 66.2214845-87.8950071 Percentile

==>> Other Backward Classes (OBC-NCL) - 68.0234447-87.8950071 Percentile

==>> Scheduled Caste (SC) - 46.8825338-87.8950071 Percentile

==>> Scheduled Tribe (ST) - 34.6728999 87.8474721 Percentile

==>> PwD - 0.0096375-87.8273359 Percentile

So with 88.13 percentile your son is qualified for JEE-Advance 2021 and he will be able to register for JEE-Advance 2021 once the applications will start and it will start by this evening.

You can check out more details about JEE-Main 2021 qualifying cut-offs from the link given below :-

https://engineering.careers360.com/articles/jee-main-cutoff

To have a list of all those colleges which you can get based upon your marks, category, and state you can use JEE-Main College Predictor:-

https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer

I hope this information helps you.

Good Luck!!

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