I can appreciate the motivation behind it, but it might be a touch excessive.
I looked at the smartpath suggestions for both FAR and AUD (see scores below) and I was very far from reaching the recommended goals as far as percentages go for more than half the categories in FAR, and none of the categories in AUD.
I feel if you hit those bench marks you will be OVER prepared.
I am looking at the REG smartpath benchmarks as I go, and calculated the amount of questions I would need to complete getting everything correct would be astronomical to bump my percentages up to their suggested level.
I'm currently at 640 MCQs in REG and overall average is 80% (Only up to Section 13, did at least half the questions for each section 1-13, while leaving some new questions in the tax stuff to review before exam.)
I did every MCQ in FAR and 1000 in AUD and I think my average for both was about 75% cumulative. (83.9 FAR 1334/1589, 75.2 AUD 752/1000)
17/31 had Green marks in FAR smartpath, 4/31 were yellow and the rest say needs more work.
3/9 RED in aud, 4/9 yellow, 2/9 needed more questions to hit target.
Cliffs – valuable resource, but don't get bogged down with the % correct as recommended, but I would suggest doing every MCQ if you have the time.
Your results may vary.