Hey there!

It's okay to not score well there's still a lot of good options. Answering your first question, yes Computer Science and Engineering is a good branch with great scope but only choose that if you are genuinely interested. Secondly, yes presidency university is a good college but your choices should be dependent on what other colleges are available to you. For instance, if you get to choose between presidency college and Dayananda Sagar College of Engineering I'd recommend the latter.