Hello Diksha,
Candidates can take admission in IISER through 3 exams :

• Kvpy
• JEE advanced
• State and central board.

For different state board different cutoff has been specified. Also marks are considered out of 500.
You can check the cutoff marks for the college for your respective state by the following link provided :
https://www.iiseradmission.in/eligibility/#E480
From your percentage of 97.4% you have scored 487 makes out of 500. Consider the category wise cutoff in the  above link for you state.
If you have qualified for admission you must first enter the marks and provisional marks card for admission. Later when the 12th class final result sheet is given you must attach the marks card for further admission process.
To know more about which college to join try our new college predictor link below :
https://engineering.careers360.com/jee-main-college-predictor

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