A new site, LispQ, helps you to learn uLisp by providing a series of problems of graded difficulty.
Initially you are offered problems at the two lowest difficulty levels. As you solve problems you will be offered harder problems.
You can submit your solution and get feedback about whether it's correct, or how you can improve it. All the answers have been tested using uLisp.
I look forward to any feedback, or suggestions for further problems.