How can I ready myself for the ASVAB test this summer?

I have always been bad at studying and staying focus and I taken the ASVAB two times already for my freshman and sophomore year and failed, I'm now going to be entering my junior year and really want to change my result to be able to join the Marines as its always been my dream but I really don't know where or how to study for the ASVAB please help me change.

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