How many lessons to pass?

I have analysed my skills, and I need some work on dual carriageways,dual carriageway roundabouts, bit more work on hills ( my car rolls back on hills when i am at traffic lights, and need more practice on stopping on hills. Need more work on reverse corner, can sometimes be unsure on lane positioning when leaving the roundabout. i can do everything else, how many lessons do you reckon i need to pass???