Hello Aspirant
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If you want to do diploma in computer science then you should be passed with 50 percentage in 10th class ( mathematics physics English) and 5% relaxation for north eastern states.
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Top institutes offering diploma in computer science in India are listed below:

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Eshan Group of Institution

Siddhi Vinayak Engineering and Management College

Annex College of Management Studies (ACMS)

Desh Bhagat University  (DBU)

Dev Bhoomi Group of Institutions (DBGI)

The average fee to pursue this course is rs 13500 to 50000+ rupees.
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The career opportunities are good to work in it sectors.it has career options like manufacturing companies, telecommunications  companies, technical writer etc .

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If you have any questions further let me know.
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Thank you!!!