250 problem set and exam questions. You work on these problems at your own pace outside of class. You can keep working on alternative variations of these problems until you've successfully answered a complete set, and almost all students who work diligently on Qwizplus eventually get a complete set of problems correct. Your work here will be included as one third the overall problem set grade. However, the main benefit is an improvement in your exam scores.
Credit is awarded for passing, independent of the number of attempts.
Also suppose that you you pass five CLL units. But please note that passing a unit test in Economics 250 is intended to be more difficult than it was in Economics 101 and students generally work longer on them. But even if students last year didn't pass a given CLL unit test, they reported that they nevertheless learned quite a bit in the process, which helped them on the in-class midterms and final exam. However, different students have different learning styles, and that is why I offer both. Keep up with the material.