Perfect rhymes:
* blessing (This could be used in the context of a test being a blessing in disguise, helping someone learn)
* guessing (This is very relevant to tests, especially multiple choice)
Near rhymes:
* testing (This is a bit obvious, but it fits!)
* besting (This could be used to describe someone outperforming others on a test)
* vesting (This is a bit of a stretch, but it could work if you're talking about the feeling of "vesting" your hopes in a good test score)
Other options:
* pressing (This could be used to describe the feeling of pressure when taking a test)
* assessing (This is relevant to the process of testing and evaluating)
The best rhyme for you will depend on the specific context of your writing. Good luck with your test-related writing!