Something I picked up over the years about scales was a method of making them challenging and easier to learn. There are those who like to say you should work with a metronome at slow speed, say 60bpm or even 40bpm. It is also useful to vary the rhythm as you play, say triplets or loud and soft in triplets playing at least 1 scales in each key every night to warm up before practicing. It takes less time than you might think. Three octaves chromatically at 60 bpm takes about 70 seconds - say 15 minutes for all 12 keys.

Here's another useful tip. Use different fingers when you practice. It comes in useful when improvising. Combinations are (In both hands):

Thumb is finger #1, pinkie is #5 as you might expect.

Play 12121212121212 for three octaves up and down the scale one hand at a time
Play 4545454545454 for three octaves one way only in both hands (This is a good one because the 4th and 5th fingers tend to be weaker than the 2nd and 3rd.

Now try 13131313 and 345345345345 then 35353535353 and 121231212312123

Your dexterity will improve and your familiarity with each scale will improve also.

Thanks for these... I've been looking for how to improve my scales

Thanks again