My daughter is 17. She has had Algebra 1, Algebra 2 and Geometry. She used Teaching Textbooks and loved it. TT has Pre-Calculus, but not Calculus or Trig. The college she wants to go to requires a fourth math, will the Pre-calculus fulfill that requirement? She had a VERY hard time with math until we found TT and I'm really hesitant on buying a different program for her.