IBEW 100 Aptitutde test (Dinuba)

Hi, There are some questions I have regarding my chosen new career.
I applied for the Electricians union in Fresno and received a letter with a date to take an aptitude test.
I've been brushing up on some math and well basically all things regarding material on said test, but I would like know anything else about it and what can I expect? To someone who has experienced the endeavor of becoming an electrician.
Is it really that challenging to become a part of something like the IBEW 100? TBH I worry whether I will have to wait another 6 months to take the test again further prolonging the process.
I've been made aware that even the interview is "graded" also.
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Sooo, if anyone in my community has any input regarding anything even remotely close to anything mentioned feel free to drop a vowel or two Much Appreciated !! -Ryan