Pick something you are interested in (or with a good/engaging lecturer). If you are interested in it, you will have more motivation to do the work and probably do better. Where there is a bell curve in operation I don't think any subjects can really be called a bludge - to conform to the bell curve someone has to get a pass, credit etc. Yes someone may naturally be good at a subject and do well on little work, but that is really very dependent on the particular person.