The phrase "after maths" refers to the analysis or consideration of the consequences of an event or action. The antonyms of "after maths" would be "preparation" or "proactive planning," as these terms refer to the action of preparing for an event before it occurs, rather than analyzing its outcomes after the fact. Another antonym could be "ignorance" or "negligence," as these terms suggest a lack of consideration for the potential consequences of an action or decision. In any case, practicing proactive planning and avoiding negligence are important steps in avoiding negative outcomes and making well-informed decisions.