Deep work
Aim to become someone who can work for periods without the need for distraction and become a deep worker! This will give you a competitive advantage in college and your early career.
In studying mathematics beyond the compulsory stage, you can develop skills in attention and concentration. Accept this challenge, and you will be doing your future self a great favour.
Read more about this at Cal Newport’s web site. See for example a blog entry on Teenage Luddites.