I missed a test during my sick days.
Do you plan to make up the test at a later date?
No, I'd rather just skip it.
If you don't make up for the test you missed your grades will suffer. You'd better schedule a time to take that test.
I'm too busy for it.
You still should try to find time for a test. It is important for your grades that you make up any of the test that you make.