Magyk by Angie Sage?
https://www.amazon.com/Septimus-Heap-Book-One-Magyk-ebook/dp/B0016P2FA6/ref=mp_s_a_1_2?ie=UTF8&qid=1538706339&sr=8-2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=magyk+series