The older books I mentioned are textbooks. They are good, but like any other book in the world, you get out of them what you put in. Copies available at cost if you're interested. In general, get concrete. Never, never, never teach magic mystical spells that involve taking a number from here and putting it over there and multiplying this and subtracting that and shoving the answer thataway and inserting a decimal point somewhere.
Numbers are real and tangible things.
The symbols on the page are hieroglyphics, and manipulation of hieroglyphics varies from weak to useless to actively damaging. And so on. I will take your advice. Well, two hours a week, on separate days, is the bare minimum to keep an ongoing tutoring relationship at this level and to make any forward progress. Any less, and the student forgets who you are, shoves the work aside physically and mentally, and you're constantly doing Lesson 1 over again.