Remember a scale isn't just a series of 8 notes played up and back using correct notes. Scales must have rhythm, smoothness and fluidity.
Try practicing your scale in quarter notes for one octave up and back down, slowly.
Then do two octaves up in 8th notes and back down still in 8th notes.
Then 3 octaves up in triplets and back down. Use a metronome set to 60; this is your quarter note.
(set it slower if you need to allowing two 8th notes or a triplet to fit in each tick).
This increases your sense of timing, forces your memory on finger crossover places by moving you faster, and also helps your brain and fingers get moving together before you move on to your repertoire or more difficult technique studies.