I just had an interview the other day and a few days later I got a letter from the company saying that I did not get the job. I think the reason they didn' t offer me the job was because I messed up a bit in the testing part of the interview.

I was wondering if it is a good idea to reapply for the job again at a later time (like a few months later) or would I just be wasting their time? They seem to be hiring every month with several openings available. I know they probably won' t consider me, but should I still try again anyway? I really think I am capable of doing the work after their training period and I don' t feel like giving up on it. What should I do?