FLVS quick classes

I am a fulltime online student. I do not go to FLVS but my class uses the same curriculum. My high school schedule was made in such a way that I would graduate in my Junior Year. I realised that when I started my Junior year I would basically have all my core courses and only need .5 an elective credit. My school allows me to cram an additional class into my schedule if I finish a course before the minimum registration requirement for new courses ends. I believe this gives me a month. I am not looking for an easy A in fact I would rather the class be AP or Honors but I guess it doesn’t have to. I just want a class I can finish quickly even if it is hard work. So basically classes that don’t have long assignments that are rather unecessary. Any tips?