It depends on your grades. I'm taking three ap classes this year, and two dual enrollment. I'm in ap lang and it's not really difficult. It's a lot of reading. But if you can handle more, I would take at least one more (AP Bio and AP US history are really hard so maybe not those). Your junior year is supposed to be difficult, but you don't want your life to be overcome with schoolwork, because the tests are so difficult. The best thing about AP classes is that, when you become a junior, the teachers stop disciplining you and start just treating you like normal people. I don't think that happens in standard classes.