See Microsoft Excel Level 1
My experience with this level two book was exactly the same when I continued my training.
This is the training material used in a 12-hour entry level MS Excel course, and is full of easy exercises that is interactive with web-based spreadsheets meant to be saved independently to the user's computer to practice different lessons. There are five lessons in total, and each one is user-friendly and very easily explained.
I trained on MS Excel 2010 in the span of four classes and this book was incredibly helpful, and will be an excellent go-to book later on when needing a refresher.