Math 12 and Physics 12 were selling points for me. I also had some experience as a construction labourer and working at a autowrecking yard. No prior electrical training.
I was hired and indentured from my 1st day on the job.
IMO, the clincher for this trade is mechanical aptitude. If you can demonstrate/prove this through jobs/hobbies/etc. you really improve your chances.
Also look for "Pre-Apprenticesip" programs... sometimes called "Entry-level Trades programs". Employers usually prefer people who have taken these. However, these programs (at least around here) are expensive and take 10 months to complete.
