Hi Souvik,
You are in your 10th, I suggest keep doing well in studies and keep yourself interested in a complete development, sports, studies, social work etc.
For a Masters in Computer Science, I suggest study well and do a Btech in Computer science from a top institute in India. After that, gain a couple of years experience in the field as a Btech with experience counts a lot towards a Mtech/ Masters.
For a Masters program, currently, you have to appear for a GRE exam and an English proficiency test like IELTS, TOEFL. You then apply to the universities of your choice with those scores.
DO revert if you need more information.
Best wishes,
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