Interleaved Mathematics Essential Connections 12 Download a draft of the first chapter plus a few extra pages here. Year 12 textbook for Essential Mathematics subject for the Australian Curriculum. You are more capable of understanding maths than you may realise. Uncovering the patterns which underlie most maths concepts will help you to understand why and how it works. Flexible strategies will help you solve problems as you encounter them, as well as making maths easier to learn and remember. Learn how to truly understand maths, not just for this year, but for your future life and career beyond school as well.