An Excel Workbook containing two spreadsheets to practice the GCSE skills of recognition of loci construction and constructing triangles accurately. One sheets has an associated answer sheet going through each question. The questions have multiple choice answers, generated using the answer and potential misconceptions. If the correct letter is given it turns the answer box green, or red if incorrect. Note that your computer will need Microsoft Excel with Calculation Options set to ‘Manual’ and Macros enabled. There is a set up sheet which gives some advice on how to do this. Clicking the ‘More Questions’ black square will clear the sheet and recalculate questions and answers. Excel’s Zoom Bar can be used to scale the sheet up and down to fit on your monitor. Note that as the questions are randomised, some questions could be repeated. With a constant number of re-generated questions (and answers), students can practice this to their heart’s content. After all, practice makes perfect!