Hello Aspirant

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The course fees will differ from college to college if you mention the College name then I will provide the information for sure.
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Computer science engineering:
It is one of the btech course. you have to do this course for 4years to get certified in that respective course.
If you get 95+ percentile score in jEE mains exam then you are eligible for NIT colleges and you may get CSE branch if you have reservation.
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If you want to know more information about this course once visit this below link you will get an idea about the course:

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https://www.careers360.com/computer-science-engineering-course
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If you have any questions further let me know.
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Thank you!!!!