I started with 5 classes this semester, dropped 3, and added 2. You do the math.
1. Strict Rules
No laptops, no eating, no drinking, no thanks!
2. Requirements
I already have enough credits for this but I need more for this and blah blah blah. Just take advantage of all your classes so you can get the most for your dollar.
3. Find something better
Well sometimes there is just a more interesting class that you hear about and luckily also has a seat open.
4. Commitments
A lot of my classes will say, "if you are an athlete do not take this class". So I am guessing sometimes having night classes and games can be a problem with missing classes.
5. Crazy Professor
First impressions are important and if they are already acting crazy on the first day you can't expect it to get much better.
6. Opinionated Professor
"I will talk a lot about the next president of the United States Donald Trump" - dropped.
7. Expensive
Taking a photography class for fun when you have to buy a camera? Maybe not the best idea.
8. Syllabus
Some syllabuses you just look at and run.
9. Difficulty
If it looks like you will not pass the class and you don't need it as a requirement, why are you in that class?
10. Course loads
The course load is large to say the least, and a lot of the work overlaps with another class? Maybe you should reconsider.
11. Bad vibes
Sometimes the class just doesn't seem like the right fit and that's a good enough reason to get out of there.