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Application Form: First, visit the official website of Christ University and complete the online application form for the B.Tech programme.
Entrance Exam: To be considered for admission, you will need to appear for either the Christ University Entrance Test CUET JEE Main COMEDK, or university-GAUGE exam.
Eligibility Criteria: It is important to ensure that you meet the eligibility criteria set by the university, which may include securing a minimum of 55% aggregate marks in the 10+2 examination, with compulsory subjects like Physics Mathematics, and Chemistry/Biology.
Selection Process: Shortlisted candidates will be invited to participate in the selection process, which may include a written test, skill assessment, micro presentation, and Personal Interview .
Admission Offer: Admission to the B.Tech programme will be offered to candidates based on their performance in the selection process and the availability of seats. Fee Payment: If you receive an admission offer, you will need to pay the fee to confirm your admission.

Both are good. But according to branch, you can opt your choice. If u want to take CSE or IT or ICT then I can say SASTRA is best, because of the high placement opportunity. Nearly 80 companies will come every year. You will have a very good opportunity of getting a job with a high package. Companies like Microsoft, Paypal, TCS and many more will be available every year. SASTRA will provide hostel scholarship and merit scholarships of nearly 34k every year. The advantage SASTRA has is, being a deemed university, it can rapidly adapt to changing technologies. Syllabus is revised regularly (annually), with the feedback from the students and alumni (I have given feedback both as a final year student as well as an alumnus, and most (90%) of the changes suggested were implemented). The quality of students is pretty good. Nowadays, 70% of seats are filled by JEE Mains Scores. Hope it helps. If you found it useful then upvote or thumbs up my answer. Good luck.