Please help me...do I need to attend the review session?

Hi,I am an incoming transfer student and I will take BMGT 340 in this fall. Besides the normal classes schedule,the class said they will hold the exam at wednesday night,and the review session will be in the middle of Friday. They did not mention it when we chose the class. I have time to take the exam on Wednesday night,but I have another class at the same time as the review session. Should I switch the class,but it is very hard now because all the class is full?Do I need to attend the review session for this class?Can anyone who took this class or met the similar problem in the past help me and give me some advice?

Thank you so much!Please help me,I am so confused!