I never practise scales except for exams. Hate their guts. They don't really help either unless you play a lot of Classical pieces such as Haydn's C major cello concerto. Particularly the 1st movement.
Cello scales have a general similarity in fingering. For each scale, know when you have to move down the fingerboard (in this instance I mean towards the bridge) and when you have to move up and to the next string. As with the piano, but less so, the flat keys and the sharp keys tend to have similar fingering. (Eg. Eb and Bb major have same starting fingering, as do Ab and Db major, as well as D and A major, and lastly E and B major.)The last octave of any scale tends to have a fingering of 1, 2, 1, 2, 1, 2, the last note being on a 3.
If you're taking an exam/going for an audition, do not worry if you forget the fingering, just use any fingering that comes to your mind. In the case of exams, you will only be penalized for bumpy scales/poor intonation.
Going slow has to be mentioned here. This applies more to pieces. You will not achieve much if you practise fast all the time. Let's say there's a difficult passage and you practise it up to speed 50 times, and play all 50 times slightly garbled. It is better to play slowly 25 times first so you can get it perfectly the next 25 times at actual speed.
Hope I helped.