How do the number of attempts I have work?
One test attempt = one completed test by a candidate. It makes no difference what type of test you send, or what level! For example, if you send three tests to one candidate and they only complete two of these tests, thats two test attempts used.
You are charged only on test attempt usage. You can check the number of test attempts you have left from within your Test Candidates account at any time.
For more information, check out our article on monitoring your test usage here.