licensed to be a pharmacy tech?? what state do you live in? i've never heard of that before. i've been a pharmacy tech for about 2 and half years, and when i first started out, i had no certification or experience or anything. you just have to be registered as a pharmacy tech (which happens after you get the job), and what you do is you go online (or fill out a form your employer gives you) to your state's board of pharmacy website, answer a few questions, pay the registration fee (which is around $30 and typically your job is supposed to pay for. ask them), and then in about a week, they send you your pharmacy tech registration certificate. You have to register every year as long as you are a pharmacy tech. Maybe that's what you meant by "licensed" ?? you meant to say register?
As far as working as a pharmacy tech while being in pharmacy school, I say try it out. There's a lot of pharmacy students that work part-time as pharmacy techs or in other positions. As long as your job doesn't interfere with your study time and with school, that's the most important thing. Make a schedule for yourself for the times and days for when you need to study and just focus on school, then fill in the times when you are able to work. But don't overdo it. Prioritize. and time management is key. Good luck!