It's the Retention Center. However, again you will know. I have not had a class that didn't give you in the syllabus the number of points and information you need to pass the class. If at one point you are not doing well not only will your instructor talk to you, but you will be referred to retention. If you do fail a class after first semester and you have to repeat the part of the semester then you will also have to go before a faculty committee in order to be reinstated - and explain what you will do to change the reasons why you were not able to maintain the course load.
Don't borrow trouble - there are people who struggle but get C's, there are people who struggle but get A's. There are people with kids, pregnant, with full time jobs. This is doable. You will get through - there are loads of us who are doing it right now.