Hello Nandana,

Since SASTRA takes admission through JEE Mains , one first need to qualify the JEE Mains. Below I have listed the 2019 JEE Mains cutoff category wise - 

• CRL : 89.75
• GEN-EWS : 78.21
• OBC-NCL : 74.31
• SC : 54.01
• ST : 44.33
• PwD : 0.11

So you need to clear JEE Mains first to get admission into SASTRA. Below I have listed the branches that SASTRA offers - 

• Aero-space Engineering
• Bio-Engineering
• Bioinformatics
• Bio Technology
• Civil Engineering 
• Chemical Engineering 
• Computer Science and Engineering 
• Electrical & Electronics Engineering
• Electronics & Communication Engineering
• Electronics & Instrumentation Engineering
• Information Technology 
• Mechanical Technology 
• Mechatronics

You can also go through this link and checkout the full details regarding SASTRA Universwity : https://engineering.careers360.com/articles/sastra-btech-admission

Hope I have solved your doubt . Good Luck !!!