Firstly you need to decide a course. 

For good career in Computer or Communication you must either Choose Computer science engineering or Electronic Communications Engineering. 

For this yiu need to appesr for exams like Jeemain and Jee Advanced which are widely accepted across India for top Institute . 

Based on State you reside you may look to also apear fkr Exams like BITSAT,, TNEA, WBJEE, KCeT, COMEDK, MHTCET.