There is no specific book that is needed as most of them contain similar information. Personally, I have found Mosby's Review for the Pharmacy Technician Certification Examination very helpful. Also, there is a ton of free practice questions online and the P.T.C.B. offers practice tests. One good starting point is the P.T.C.E. guidelines and understanding their contents:
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In PTCB Community you can ask and answer questions and share your experience with others!
I believe this was the one I used: https://www.amazon.com/PTCB-Exam-Study-Guide-2020-2021/dp/1635306574/ref=pd_rhf_ee_p_img_2?_encoding=UTF8&psc=1&refRID=836FAGNEWDNS8411NX1R36
Combined with the PTCB app (I subscribed for about a month, if I recall correctly) and various online sources. I tried to cover all my bases and study math. Use as many sources as you can find, and I recommend flashcards too! Best of luck!