Hi Adhisha...

First u need to attend JEE Mains, If u are qualified then u can attend the JEE Advanced.

You need to get above the cutoff for qualifing.It depends on the paper difficulty and trend varies accordingly every year.

If u are into any reserved category it is easy for u to qualify.

Hey Adisha.

First you will take the JEE Mains examination and then if you qualify the cut off released you will be able to attempt the JEE advanced. So you can take both the exams only if you qualify the cut off in Mains first.

Down below is given the cut off to qualify in the sequence- minimum marks in each subject, minimum total marks, minimum revised total marks 

Common rank list (CRL)  12  126  90

 OBC-NCL  11  114  81

 SC  6  63  45  

ST  6  63  45    

Best of luck