Call me old school, but honestly we were assigned this book in 9th grade Spanish. I took the initiative and blew threw the entire book. Just the repetition of writing everything down over and over again really cemented the conjugations in my mind. Lo recomiendo mucho!
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https://www.amazon.com/Practice-Perfect-Spanish-Tenses-Second/dp/0071639306
Practice Makes Perfect Spanish Verb Tenses, Second Edition (Practice Makes Perfect Series) [Idioma Inglés] https://www.amazon.es/dp/0071639306/ref=cm_sw_r_cp_api_i_PoALFb0TRZXX1
I made a lot of progress with Dorothy Richmond's "Spanish Verb Tenses" book.