Glenda, I don’t know anything about the Texas exam but if I did I’d tell you the same thing. The trade would be well served by having more female plumbers but even better served by those (man or woman) that became plumbers through sheer strength of character and desire to succeed.
You know this stuff, Glenda. Keep your books open always and just keep reading, and when you read ask why and read up on that if you can’t answer your own question.
Good luck on your re-test. You can do it!