The Driving Genie’s recommendation Is that you get your theory test booked as soon as possible. Learning the highway code will not only give you a head start with your driving, but it will ensure that you don’t end up in the situation where you are ready to book your practical test, but can’t because you haven’t passed your theory! No one knows upfront how long it will take you to learn to drive, so leaving your theory to the last minute is not a good idea. Also, if you’ve started studying for your theory, you’ll know any areas that you may require some extra help. Your instructor can then give you any guidance needed.
To help with your studies check out the dvsa link. This will give you access to everything you need to pass.