I've never programmed in Clojure or Java before, I figured I'd give it a try. I got hung up on a very early, and with no way to see the solution I'm stuck googling (to no avail) and trying random things (waste of time). Why can we not see the answers? Is this a standardized test or a learning tool? I'd feel silly going to a IRC channel to ask the devs what the answer to intro to strings was.
If you choose to "follow" some of the people who've completed all of the exercises you can then view their solutions. I too found this confusing early on.