it all depends on what you wanna work on and how much yours willing to spend for school. I was suppose to go to uti this month but decided not to go due to certain reasons. I checked out the school and was really impressed. Everything was clean and up to date. The schook is expensive though. Tuition for 15 months was about 30k and i gave myself a rough estimate of 45k after living expenses and stuff.
The cheaper and possibly better way is to check out your local tech schools and community colleges to see if they offer any automotive degrees. Then get a job at a dealership and work your way up to becoming a mechanic.