This booklet contains suggestions for developing six of the twenty topics recommended for students in Secondary Forms III and IV in the schools of Victoria, Australia. These suggestions are intended for students for whom the standard course is unsuitable because of subject time allotments, ability levels, or vocational or educational needs. The six topics are Hire Purchase; Income Tax; Topology; Curve Stitching; Probability; and Relations, Loci and Graphs. Objectives of the modified course, and a bibliography of reference materials, are also included. (MM)