We all have different natural attributes and skills that we have picked up and developed over the years; for example co-ordination, decision making and road sense to name a few. This means that each individual student's base learning level will drastically differ and pupils learning speeds will also vary.
Your A-Class instructor will work with you and teach you in a way that you understand to help develop your driving skills as quick as possible. They can also conduct a driving assessment for you and observe your current knowledge and how you are taking on and responding to new information.
This can help to give you a more accurate judgement of your current ability and how to move forward. Your instructor will work with you in a way that works best for you to maximise your progress during your lessons.
Remember there is no minimum or maximum number of lessons, you are ready when you are ready!