I finish all PR steps and now I need to SR/dip.

Book have ~400 pages and I have ~30 questions from trigger words (preview and postview).

What is right way to SR/dip:

1) to SR/dip book from beginning to end few times (3-6 pass) and to try to answer this (~30) questions

2) or, I pick one question (or few similar if exist) and start SR/dip book from beginning. When I find answer to that question (for example answer is in page 150, in 2 sentence - book have 400 pages) I stop there, and I pick another question and I start again from beginning of the book and SR/dip to find answer to that question. And I start SR/dip book again from beginning for every new question.

What to do?

Or should I mix both approach?

If I don't have trigger words (questions) then I SR/dip whole book from beginning to end in one shot to find trigger words (questions)?

And if I have trigger words (questions) I use #2 approach?
For some questions I already know where answers are.