What is A1 quality?

[Kati Svaby]

English Language Tests, Intermediate level

ESL/EFL Test #298 "English Slang Idioms (20)", question 7

Bill complimented his friend on the ......... quality wood he purchased to build his deck.

(a) B-grade
(b) mediocre
(c) A1
(d) cheap

English Language Tests, Intermediate level

ESL/EFL Test #298 "English Slang Idioms (20)", answer 7

Bill complimented his friend on the A1 quality wood he purchased to build his deck.

Correct answer: (c) A1
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Does "A1 quality wood" mean that the wood etc is ' first rate'wood? or it is good quality?
Kati Svaby
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We always deceive ourselves twice about the people we love - first to their advantage, then to their disadvantage.

[Beeesneees]

First rate quality, Kati.
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Cheers m' dears!