[header] How to prepare for a mathematical test on constructions [title] Always use new geometrical instruments. [step] It is very important to use only new instruments. It can be three to four years old, but not older than that. 
Often, old instruments don't give accurate results, so it's better to buy a new one for yourself instead of using the one your mother or uncle used. [title] Before buying a geometry box, check if it contains all the geometrical instruments you need.