Hi there, I'm from singapore too. From what I know, Sheffield's curriculum does not gravitate towards PBL(I've applied a gotten an interview there). I did not do all that well for UKCAT, in fact, based on past history I should not have gotten into interview stage for sheffield. So maybe they do place quite a lot of emphasis on your academics and PS. Glasgow and manchester would be good choices for PBL. I suggest you rank your chosen schools by researching on their curriculum, cost, reputation, city and admission requirements. By the way as long as your first language is english, most unis dont require an english test. Good luck