Dear Hareesh,

As per JEE Main notification if The name of the candidate in Aadhaar in not exactly similar or not in same pattern as in school records then

Candidates should submit a correction request at Aadhaar centre and apply for JEE (Main) by entering 14 digits Aadhaar Enrolment ID/UR No. (Including slash) printed on the slip issued by aadhaar centre after submitting updation request. Or

Candidates should fill the form of JEE (Main) with old details in Aadhaar card and thereafter submit a correction request at Aadhaar centre. The updated details in Aadhaar may be corrected in JEE (Main) at later stage by the process which will be notified in due course of time.

You can refer point no. 4 in below JEE Main Clarification ragarding aadhaar:

JEE Main CLARIFICATION REGARDING APPLYING WITH AADHAAR

So, Don't worry about that and submit a correction request at nearest aadhaar centre and CBSE will provide you a chance to correct your details.