Can I handle this kind of schedule as a Junior?

As long as you can keep up with the homework and still make time for yourself, you should be ok. It'll be hard, but if you're ambitious and well organized you can do it. I wouldn't take on a whole lot more than that, but then again I'm not a very organized person. My only advice with a schedule like that is pay close attention in all of your cles, ask questions for anything you don't get, and keep up with homework. Good luck :)