The application forms are still yet to be released, which are generally released in the last week of the March or first week of April. The application form last date goes upto June first or second week. The university accepts 70% of seats via JEE score and remaining 30% of the scores using 12th scores cutoff. You can refer to this link below for faster updates on applications dates, 

https://engineering.careers360.com/articles/sastra-university-btech-application-form/amp