Depends on the facility, where it's located, who owns and runs it, and whether or not they pay minimum wage and comply with state and federal labor laws. A LOT OF PLACES in the horse business DON'T, as I know from bitter first hand experience. I was a working student and later, a stable manager in the horse industry for over 20 years, and during all that time, I only had ONE employer which actually complied with federal and state labor laws and paid worker's comp insurance. The usual practice at most places is to claim that workers are "independent contractors" and therefore aren't entitled to receive any kind of insurance coverage or benefits. And there are places which pay only in cash, and under the table, too. Unless you or your dad go and talk to the people who run the barn where your horse is, you won't know whether or not that's the case there.
And if by chance you decide to go the working student route, I'm going to warn you right now that it's NO PICNIC in the park. It really ISN'T. You can expect to work long hours for little or no pay, and to get treated like sh*t most of the time. The only benefit you will likely receive is riding instruction, and perhaps, a reduced board rate for your horse at the facility if the owner decides that you're worth spending time on. If you don't have talent and a drive and desire to learn, your odds of being able to stay on as a working student anywhere are essentially ZERO. Keep in mind as well that trainers and owners of such places can fire you at any time, for any reason, or FOR NO REASON AT ALL. They can decide to show you the road just because they happen to be in a bad mood. Make that you go into something like this with your eyes open, and with the right attitude. Don't ARGUE, talk back, or play the smart a**. Don't make your employer tell you to do ANYTHING more than once, because if he or she has to do that, you're not going to last very long. Do your job and keep your mouth shut, and you'll be all right. Don't expect special favors or to be treated any differently than anyone else because you're a student.
I'm not telling you these things to scare you or turn you off- I'm simply giving you the benefit of my experiences, which weren't good ones. Hopefully, you can avoid going through some of what I went through.