The sooner you start studying theory, the better prepared you will be when it's time to take the real test. If you have the chance, you should mix study with driving practice. This will make you acquire new knowledge as quickly and efficiently as possible.
As a member of iKörkort.nu you can study the theory in a very structured and effective way by playing The Licence Game. It is fun and will teach you everything you need to learn to pass the theory test!