The best thing you can do is study grammar, sentence structure, and expand your vocabulary. Being well spoken will probably help more than anything else. Read some things on critical thinking, on any branch of logic you prefer; epistemology is particularly appropriate, as magic generally exploits what we think we know about the state of things in a trick. The Knight's Tour from 13 Steps looks like it takes a lot of brain power. Saw Ricky Jay do that while reciting a Shakespeare soliloquy and doing cube roots of numbers.