There are always rainy days when you can't fly
In the North East, plenty!
I used Quiz Aero as well, people moan about the cost but compare it to the price of a lesson. Building on PilotDAR's and eckhards suggestions, do some practical tasks - look at METARS/TAFS and try and decode them, plan routes on a chart so you have to understand what the symbols are, do practice exams - really identifies the areas you don't understand and utilises your competitive spirit...