I'm a very slow thinker, too. I'm also a slow writer, so timed essays are almost impossible for me.
I can learn quick though, if I'm trying to learn the right thing. I learn with my hands, so anything I can learn by writing, playing, or handling, is something I can learn pretty quickly. There are lots of different kinds of learning, you just have to figure out which one you're strong in. I'm terrible with listening, though. Someone will give me an order at work, and I'll forget it in seconds.