They play #5 Barnet in 3 days, that's the hardest competition they have left on the schedule. They have 2 games against people in the bottom 4 and 1 more against Boreham Wood. So at worst I could see 9 more points for them, though I wouldn't be surprised to see them get 10-12 from this final stretch.
Notts on the other hand has Woking #3 and two gimme games. I could see them getting a max of 9 points but more likely 7 to close out, which would mean Wrexham would only need 2 wins and a draw to complete the Automatic Promotion at maximum or 2 wins at minimum if Notts doesn't win out here.