If you're talking about the Managing and Troubleshooting PCs book, I say it's not worth it. the standard book alone contains a ton of info for the A+. the Managing and Troubleshooting PCs book apparently is for more practical applications but honestly you can find that all on google.
Is this the book your talking about? https://www.amazon.ca/gp/product/1259589544/ref=ox_sc_act_title_1?smid=A3DWYIK6Y9EEQB&psc=1
Planning to get one, I'm starting to review for A+.I have no background on IT thought.