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Yess!!! Mathematics is compulsory in your 10+2 examination to be eligible to get admission in B.Sc Computer Science. you must have passed class 12th with PCM with minimum 45% from any recognised board you may get admission easily through your 12th marks.

Bachelor of Science in Computer Science is a Under graduate programme, this is three year duration course and divided into 6 semesters. Average fees for B.Sc CS is in the range of Rs 10,000 - Rs 25,000 per year, after this course you may get salary Rs. 8000 to Rs. 25000 per month depending on your knowledge and experience.

for more information about B.Sc CS checkout given link below:
https://www.careers360.com/courses/b-sc-computer-science

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All the best!!!