No refunds will be issued for any cancelled STAMP test scheduled as a group test..  

Avant STAMP stands for Standards-Based Measurement of Proficiency and is a web-based test that assesses language proficiency.

STAMP 4S (offered in Arabic, English, French, German, Hebrew, Hindi, Italian, Japanese, Korean, Mandarin (Simplified & Traditional), Polish, Portuguese (Brazilian), Russian, and Spanish)
An Avant STAMP 4S test has four sections – Reading, Writing, Listening and Speaking, and the results of this test inform test takers and educators about learning progress and program effectiveness. Avant STAMP 4S test items are based on real-world, everyday situations. Avant STAMP 4S measures a test taker’s language ability according to Benchmark Levels that are based on national standards. Test results will indicate the level of proficiency achieved for each section of the test.
https://avantassessment.com/stamp-4s-test-taker-guide

STAMP WS (for other languages not mentioned above for STAMP 4S, see complete list here: https://avantassessment.com/stamp-ws)
The Avant STAMP WS language proficiency test is a semi-adaptive test. Test takers will be asked to answer seven self-evaluation questions that best represent their skill/ability level in both the Reading and Listening sections. The self-evaluated reading score is used to determine the level of prompt delivered for the Writing section. The same applies for the listening self-evaluation related to the Speaking prompts. This allows the language productive sections to be more appropriately leveled for the test taker. STAMP WS provides the same detailed reporting of levels based on the ACTFL Proficiency Guidelines as Avant’s other assessments.
https://avantassessment.com/stamp-WS-test-taker-guide