Summer School?!!?!

Okay so I have to take over the Living Environment Regents in August which means I have summer school but the problem is that I’m going to Florida and I already brought the ticket and it’s no refund so like I was wondering if I could not go to summer school Because I passed that course already but I could be back in time to take the Living Environment Regents over when I come back. Plus In Florida I have a tutor in Florida when I get there so I wouldn’t miss out in summer school. So is it possible I could not go to summer school but take the Regents over or it’s a requirement to?!!!??