Work ahead in your classes. That way it's easier to make sense of the lectures because you walk in the door with enough context to fit the new information together. And if you catch sick during the term and lose a few days, you aren't behind.

Also, find a reason to visit each professor during office hours early in the term. Ask them to clarify something you're confused about. If a term paper is required for the course, meet with them for advice about what would make a good subject to write about. They'll often give you a list of important authors within your topic of interest, which can save you quite a lot of time and effort.

Read the syllabus. Reread the syllabus before you email the professor. Don't wait for the end of the term and beg for extra credit.

It's the students who show up for class prepared and who manage their time well who get networking assistance and and strong references from the faculty.