That's fine. You managed to learn optics on your own. Great. Actually, of all the topics in Physics 2, optics is the easiest, and probably the best self study candidate. But you do a disservice to prospective test takers when you say that it's doable to take the test without physics 2, and that it's not even that hard. I hate to see people taking this test without adequate preparation because someone they know said don't worry about it. This test needs to be taken seriously if it is to be taken at all. For every one person who cut corners and made out ok, there are another 10 who bombed it, probably on similar bad advice. It's great if it worked out for you. Understand, however, that this is not the norm.