Graduating in the Summer/Late start date

Hi everyone, 

I saw a similar topic but it was dated but I'm in a similar position. Currently, a junior with a SA gig at a BB this Summer. With everything going on this past year, I decided to lighten my load but after speaking with my advisor, he told me that I'm behind on graduating and would need to take extra credits. Honestly, I'm not confident taking more than 4 classes a semester (my school is also known to be pretty tough) but my school does offer Summer courses AND graduation. Would there be an issue with that? Also, after a quick search, it seems like most analysts start in August, is that still true?

Thanks