I don't have computer science in HS. Shall i able to apply for CSE or IT?:

In order to take admission for B.tech CSE, IT programme, JEE Main is the National level Entrance Exam for the admission to Engineering programme to various B.Tech/B.E. programmes offered by 31 NITs, 23 IIITs and 23 CFTIs, As per the eligibility, It is mandatory to have at least five subjects in class XII or equivalent examination to apply for the exam. You must have passed Physics and Mathematics as compulsory subjects and Chemistry, Biotechnology, Computer Science or Biology as one of the optional subjects in the qualifying exam.

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Hiii

Yes ofcourse you will be able to apply for CSE or IT in your undergraduate courses even if you have not opted for Computer science subject in your higher secondary exam.
The basic requirement for CSE or IT engineering is that you must have qualified class 12th exam with subjects physics, chemistry and maths and have scored atleast 50% marks.
Also you will have to clear JEE Mains for almost all the colleges and universities like NITs etc or simply go for the university level entrances for the particular university you are interested in. If you wish to get admission to IITs you will have to qualify JEE Mains with top ranks and then clear JEE Advance also.
https://www.careers360.com/computer-science-engineering-course

Thanks!!