Which math strategy video series is the best?

If I only have time to go through one of the following 4 series - Dedicated Quant Strategies, Quant Toolkit, Quant skills checklist, or Quant Tips, Tricks and Shortcuts - then which one should I do?

Personally, I’d like to ask how’s your pp score? For example my pp1 score on quant is 167, so I just choose to watch videos about hard questions in “slove quant problem” on site.

Choose any one at random as the first two are about strategies and the last two are about common concepts that are asked in GRE.