Why why why did I do it wrong?

A course of driving lessons can take an incredibly long time to complete and like any learning experience can be fretful and joyous.

Generally, students learning to drive will be motivated to drive well on every lesson but realistically this doesn't always happen for a variety of reasons.

Intrinsic and Extrinsic barriers will affect the outcome of every lesson from monetary concerns, attitude, peer pressure to worrying about making mistakes.

Errors are an integral part of learning the learning experience and can be beneficial to the overall outcomes if they are learned from.

This is where the problem begins.

The students driving instructor has an obvious influence on the success or failure of each and every lesson and, unfortunately, this can result in the breakdown of learning and motivation.

Whilst a driving examiner only has to find fault with a student's drive, a driving instructor needs to identify the problem and correct it with understanding.

In my experience as a driving instructor trainer overseeing the skills and conduct of instructors for nearly 20 years, I regularly observe instructors identifying faults and making an effort to remedy them but failing to analyse the cause of the problem. 
Indeed this is a common reason that so many trainee instructors fail to be successful on their examinations.

Every fault must be analysed when a fault has occurred and ensure that the fault analysis is accurate.  The pupil needs to know what went wrong and why

If the student appreciates 'why' the mistake happened and its consequences then that the pupil will learn effectively and understanding will be promoted so avoiding the mistake happening again or as often. 

An example of good fault analysis can be seen below in bold.

Fault id: Touching the kerb when turning left from a major road.
Fault analysis: The reason why you touched the kerb was because you turned too early the consequence of touching the kerb is you might damage the tyre/wheel or endandger pedestrians.
Fault remedy: To avoid touching the kerb, turn when the front of your car reaches the point where the kerb starts turning.

Very simply, this means that every relevant fault MUST have the reasons 'WHY' instructed satisfactorily and if they are not, make sure as a student, you ask 'why' enough to understand.

Further details can be found at driving instructor training.