Hello dear student,

As you said you have completed your class 10th. Now you have to opt for computer science with physics Chemistry and  mathematics as your subjects for class 11th . As you want to pursue computer science or cyber security . So for that you have to obtain minimum 75% of the marks in your class 12th boards if you belong from general category while if you belong from SC/ST category you need to have minimum 65% aggregate marks,  with a good percentile in JEE mains exam. So the entrance test that you need to give is JEE mains , on the basis of the marks you will obtain in this exam you will get a college according to your rank .

i hope that this was helpful for you . Thank you