I wanted to study Computer Science & Engineering. What do I need to do to study that subject? What are the things I should know before get admitted to this subject?

Hello and thanks for the A2A. Since it’s a CSE course , you’re going to have to be comfortable with math and physics from high school , maybe learn some programming before going to uni (check the first semester programming language and start practicing on that for starters to get a head start). The rest will be taught to you in uni.