Piano practice technique

[ruks_dentist]

I am preparing for my LTCL Diploma exam to be held in october this year.I am also a practicing endodontist.I want  to know the correct method of practicing to prepare myself for the exam,how do I strengthen my technique(which exercises are recommended)I take piano lessons in pune,india at the St.Cecilia's school of music.how many hours of practice are required?
repetoire:
Bach prelude and fugue in h
Mozart sonata K310 in a minor
Chopin Nocturne Op.27 NO.2
Rimsky-korsakov-Rachmaninoff flight of the bumblebee
debussy images book 1

[whistlestop]

Hello ruks

This is a surprising question from someone preparing for LTCL; I would think the wisest strategy would be to do whatever you have been doing already but do a little more of it.

I am working towards Ltcl and my teacher urges me to do Dohnanyi exercises 9-13 but I find them very difficult to do. There are those who maintain that you don't need to do specific exercises but to pick out tricky passages from your pieces of music and make an exercise out of them.

How much practice? How long is a piece of string? Probably about 5-6 hours per week as long as it is mindful, concentrated practice.