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As per your query admission in BCA(Bachelor of Computer Applications) is taken through merit(12th Marks) and through entrance exams also some of most entrance examination for BCA are AIMA UGAT, IPU CET, SUAT, GSAT, SRMHCAT, KIITEE BCA. You just need to apply in college for BCA course

The average fees is around Rs 70,000 - Rs. 2 lakh, it may vary from college to college

Here is the list of Top BCA colleges in India:

-> Indira Gandhi National Open University (IGNOU) New Delhi. Fees: Rs 40,200
-> SRM Institute of Science and Technology Chennai (SRMIST Chennai). Fees: Rs 2,55,000
-> The Maharaja Sayajirao University of Baroda (MSUB) Vadodara. Fees: Rs 1,33,920
-> Vellore Institute of Technology, Vellore. Fees: Rs 1,65,000
-> Lovely Professional University (LPU). Fees: Rs 3,36,000

To know more about BCA checkout given link below:
https://www.careers360.com/courses/bca-bachelor-of-computer-applications

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All the best!!!