On my arrival at Sampere, I was given an entrance exam for class placement. Because of frequent travel to Latin America, I could read Spanish much better that I speak it. As a result, when I discovered I was way above my head in my first class, the school promptly adjusted my level, offering a better learning experience. If you have any doubts about the level in which you are placed, let the school know. Do the little assignments that are requested.
Nothing slows down the class more than an unprepared student.
On the other hand, if there is a point about which you are confused, make it known to your instructor. Chances are other students may also need some more work in the same area. The more give and take between instructor and student, the better an immersion course works. The most important thing is to have a good time. Immersion classes are designed to give you daily living language skills.