I got:
1) MLK
2) + -> pentagon [edit: not circle

]
3) RSUT
4) o
5) <> -> + (diamond -> plus)
But I need to check that again a few times.
[edit 2]My second answer is different to Vincents, but I tried it his way and (assuming we have both come up with the right theory about how this works) that works too. I did a test like this not so long ago, it was called a psychometric logic test or some such.
I scored very highly on the language, mechanics and spacial sections (99%! such genius!) and not so well on logic or maths. Well, I didn't answer all the questions but the ones I did answer were correct. But that was odd because generally I'm good at logic and maths and suck at machanics and, I think you'll agree, language. So the system sucks.[/edit 2]
-zudo