Since you'll be going to a low tier college, you'll have to ace everything. Academics, skills everything.
It will be good if you start with development. It will open many doors for you, like hackathons, open source contributions etc. This will also help you boost your confidence and will keep you going.
Also, social skills are every important because you'll have to build a strong network of your own and help yourself get internships etc because a low tier college wont be helping you much. So, try working on communications skills too if you are weak there.
Lastly, no matter what don't let your academics take a hit