Hello,
NIT, Thiruchirapalli does not offer BCA in undergraduate level.It offers MCA in postgraduate level.So you need to seek admission to BCA in any other college and after completing your graduation you can get admission in NIT, Thiruchirapalli in MCA through NIMCET.
Hello student as per eligibility criteria candidates need 60 percent marks aggregate in last qualifying examination from a recognized board or minimum 6.5cgpa (on a 10 point scale)
Admission is in the basis of entrance test.
For more updates refer to the link mentioned below - https://www.nitt.edu/home/academics/departments/ca/programmes/msc_computerscience/admission_procedure/
Feel free to comment if you have any doubt
Good luck
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