hello mohitgadhvi2003
I hope you are doing good . I would glad to aware you that snusat exama and application form is two different things. Actually the thing is SNU give privilege to students who had score greater than 80percentile in jee mains , so they only need to apply through application form . Rest of the studnents who dont have good percentile, they need to go for SNUSAT entrance exam and personal intereview for getting admission in SNU . You can refer to following link for more details
https://www.snuadmissions.com/admission_info_2021.php
Hope you found this answer helpful. Good luck for your future
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