Get the practice test out of your mind. It would be normal to struggle on practice tests if you haven't completed your outlines and studied them by trying to understand the big picture.
First, finish your outline. Then, piece it out into sections and study it in sections. Study offer first, then study acceptance, and then study consideration. Then stop and don't go any further. Don't do any practice exams or multiple choice questions yet. Go back over all three again separately and then as a whole and see how they interact. Group your outline into sections: study the sections individually and then study them as a whole. It makes it easier if you piece sections out because then it doesn't seem so overwhelming. Once you have studied each section individually and then as a whole, and once you start to see how it all comes together, then start doing the practice exams. You should find a big difference.