We do not recommend the old 2nd edition of Saxon 7/6 because it does not properly prepare students for upper-level math. It does not have the lesson reference number next to each question to quickly re-learn the concept nor does it have a solutions manual that with step-by-step solutions for every question.
Instead, we recommend using the 4th edition of DIVE + Saxon Math 7/6. This will provide excellent preparation of Saxon Math 8/7, 3rd Ed. Students who complete Math 8/7, 3rd Ed can skip Saxon Algebra 1/2 and take Algebra 1.