This is a new unit. Some of the material was previously given in the old Algebra 2B and consequently some of the questions in past exam papers from that unit are relevant. Those are available at the library. However, the content changed in 2023, moving it closer to this unit, so exams from 2022 and earlier are probably of little use, especially as they were online exams. A significant part of this course was not covered in any version of Algebra 2B.