AU Viper, EnglishCurryClub is pretty much right.
It depends on which part of the course you're in. The first 7-9 weeks is theory, and there is about an exam a week, and you'll be studying every night, to make sure you keep up with all the new information being thrown at you.
Once you get past the main theory block, the exams space out a little more, one every couple of weeks, but once you get in the sim, you'll have assessments there as well. Not as much study required once you start sim work, but you'll still be learning new phraseologies, new procedures, etc so you will still be studying. Plus I highly recommend doing extra sim runs with your coursemates if possible, gets you more comfortable with everything. Some people think doing runs without instructors is bad as you could learn bad habits, but your mates will (helpfully!) point out issues and you can all work on things together.
The vast majority of students at the college are more than willing to help, have a chat about things and share their experiences
The instructors are very dedicated to getting people through, and helping you understand. As people have said, just tell them if you don't get something. They're not going to think you're stupid, they'll just find another way to teach it
Best of luck!