Never neglect going to church. For some college students, Sunday is the ultimate rest day. But setting aside worship is an unhealthy way of living for Christians. If in a dormitory, find a church nearby. Hebrews 10:25 says, "Let us not give up meeting together, as some are in the habit of doing, but let us encourage one another..." Remember, hearing the Word even just on Sundays is more important than hearing your professors for the rest of the week!
Choose the right circle of friends. Like what I said above, secular colleges are full of other Christians. Don't think of it as "You and what army?" perspective. In fact, they're with you even before you got into that college, you will just have to find them. Choosing the right circle of friends will be a simple yet wise way of keeping in track of your faith. A better option would be joining a Christian organization in your college.
Even so, you can go around not just in your Christian circles but also to other people. Making sure that they are positive and they respect your beliefs. Expect them to understand you for not barging in some of their activities that disturb you. 1 Corinthians 15:33 says, "Do not be misled: “Bad company corrupts good character.”" It's better to isolate yourself than to let them corrupt your faith!
Don't become preachy. Never think of it as this: "I'm living this way, and so they should!" The urgency of our mission could be approached in some other way. Respect is all we need. The fact that we are all imperfect simply implies that we people must accept each other's flaws no matter what. Accept them for who they are, and expect them to do the same with you.
Choose the right time to stand. It can't be avoided that sometimes our fellow classmates and professors will try to penetrate our faith and put our mindset in shaking. James 1:19 says, "...Everyone should be quick to listen, slow to speak and slow to become angry" Do your best to speak for yourself in a civil manner as much as possible. Sometimes, ignoring those who persecute you may get them silenced, that's a wise move also. Also, if a professor blatantly attacks you academically in discussions or unjustly gives you low remarks because of your faith, gently talk to that person. Remember, ask intently but respond in love, you may win that person over if you try to show what you can testify.
Take note, there are still lots of things to consider, especially college is a nest of changes and temptations. But remaining in track is a test of faithfulness. And keep in mind that all our works are not in vain, because God rewards eternally those who endures with him.