Cambridge IGCSE™ Physics 4th edition: Hodder Education Group Paperback – 26 Mar. 2021

The third edition of this book was great because you had previous IGCSE questions with answers in it. This version gives you the questions, but if you want to check your answers you need to purchase a subscription from Hodder Education's website.I already paid for the book, I don't see why I have to pay more.