This book contains the following;[br][br]1. Questions from the O Level Elementary Mathematics papers that have been randomised. That means each time the new problem button is clicked, a similar problem is presented but with different orientation, angles and/or dimensions. [br][br]2. To-scale 3-D constructions of 3-D problems. This enables better visualisation of the problem. The diagram can be rotated and viewed from any direction.[br][br]No detailed workings are given for the solutions, only the final answers. Since these are randomised versions of essentially the same problems, the detailed workings to find the answers would be similar to those found in the 10-year series books published every year.