Hey manisha,
To get admission in Msc computer science (hons.), eligibility criteria is :
~Candidates with BCA or Bsc./Bsc. (hons) with minimum aggregate of 60%
~. Maths as a compulsory subject.
In few universities, there are entrance exams for admission in Msc. (hons).
As I can see that you have aggregate of 55%, therefore it would not be possible for you to get admitted in Msc. (hons).
Don't get disheartened. You have a bright future ahead. If you want counselling regarding which course you should go for, feel free to drop a comment below.
We would be glad to assist you.
All the best!
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