Economics HL / Business & Management HL - I'm a B&M student, and I'm just going to tell you this - It includes a lot of memorising. There is a lot, A LOT, of content. My friends in economics find it easy even though they are in math SL. However, I think business will be more useful for me. Psychology HL / History HL - I've never been into history even in grade school, so this might be a little biased but I'd rather choose psychology. Biology SL / Physics SL - Physics involve a lot of math. It's not my best subject, so I'd take bio. But if you do like math, choose physics!