hey, well in class we are using a text book calle Engineering studies a students workbook by john rochford. Its the red one..not the yellow one if you want to purchase it. It is a great book designed for the the use of HSC students. I also got the Excel test book senior high school by peter metcalfe & roger metcalfe. There both great books however the book by john rochford is better on a mathhematical note whilst the excel is more in depth in the theory part (materials etc...). CYA