You're from Canada aren't you? Those are the RCM syllabus technique exercises aren't they? I just finished my grade nine, and you probably don't want to know how I did it. I did it all twice everyday for about a week. No pieces as you can imagine. Once I got it down to about 4 hours to do it 2x, I brought the pieces back in, and with the technique did only half one day and half the next. Two hours of technique a day. Did this for quite a while, and as it got faster, got it down to 2 and a half hours to do it all twice. (My teacher makes me do it all twice, like every requirement two times before moving on to the next scale or whatever). So then I did it all everyday and half my day was technique and the other half piano. I recommend doing it all everyday as soon as possible because I waited too long only doing half and half and didn't have enough time to get it good before the exam, which cost me a couple marks.
My technique was REALLY SLOW when I started though, so that's why it took so long. If your technique is already at grade 8 speed you have an advantage I didn't.
On the practical side, try doing it chromatically. Like scales for example do C major, then without repeating the bottom c go right into c minor harmonic and again without repeating the bottom c, do the melodic version. Then you have one metronome tick to jump up to C sharp major and start again. When I said I do it all twice I meant like C+, C+, c minor harm, c minor harm, c minor mel. c minor mel. and so on.
Right now, I'm starting again. Half my grade ten technique one day and half the next. I've actually got it down to 2 and a half hours to do it all 2x, but I haven't tried it all together yet. I should. I don't know if I have the stamina, yet. Right now, my pieces are worse off then my technique though, so they get precidence.
I know my answer was probably not music to you ears. But it does work. On the bright side, know you're not alone! All us RCMers are with you!
Topic: how to practice those stupid technique?