afaik, you can go to alot of umat prep courses, but id say what other people mentioned about taking iq tests would be just as good, especially for the visual logic parts of the test. Personally, i got through just by doing the 10 or so questions in the application booklet, but everybody's different.
The most annoying part about last years umat tho was the organisation. I dont know about everyone else, but i was in the afternoon session and once everyone was inside and seated, it took about 2 hours to start handing out the test papers. It was so stressful :/