The history allows you to have the list of the last 20 mathematical exercises that have been done, the answers of the users are memorized and can be compared with the expected answers. It is thus possible to check the types of error and to focus on the difficulties encountered. The math exercises that are in this list can be done again by clicking on the restart link.
There is no history available yet, the history will appear as soon as you have done exercises that you can choose from this thematic list of math problems.