The FAQ's may say that all spells are tested and work. This however is not exactly accruate. There may have been a time where all spells were tested and proven to work, but then you get all these people who come on here and join a coven that puts them straight in as council or join other coven then by one means or another work up to council, then post spells that are fake or don't even make any legible sense to be properly performed, and some are not even spells for that matter.
Now as for the "Trick" spells working or not, this is a rather debatable topic. Some people will profess why they will work or will not work, may give reasons that back up their personal thoughts in the matter. Some, like flying spells, cannot be done on the physical plane and can only be done in the astral or in dreams. Others cannot really be done by spells or possibly can be aided by spells. But most of what are classified as "Trick" are mental capabilities that are done through training your mind and/or by a high amount of energy to be accomplished.
With all of this in consideration when looking for spells to do, apply logic and common sense to help determine what spells are legit and what spells are fake.