Welcome to the forum.
I am confident that the information you seek can be found in the thread entitled
1,001 questions about the ASTB (post your scores & ask your questions here!). At the time of this post, the thread is 80 pages.
Read every single page. Grab a cup of water or coffee, or maybe a bottle of beer, and just sit there and read. It'll take you awhile, but hopefully not nearly as long as your military career will last. Copy links and useful information into a Word document that you can reference later. Gouge is nice, but the ASTB discussion is also fantastic and tremendously helpful.
I will say this in a friendly manner before you potentially hear it in a less friendly manner: Make sure to use the "Search..." function before asking anything on this forum (or in general, since it's common forum etiquette). AirWarriors is a ridiculously dedicated community filled with passionate service members present, past and to-be, and you will almost certainly find any questions about the aptitude test answered in that thread.
That said, if you read all 80 pages and use the "Search..." function and still do not find your answer, make sure to note that you tried and then feel free to ask.
Again, welcome!