"Come to scratch" is an idiom that is commonly used to mean being prepared or ready for something. It can refer to one's readiness to take on a challenge or to fulfill an obligation. When trying to convey this idea using different words, one can use synonyms such as "get ready", "prepare oneself," "be up to the task," "be equal to the challenge," or "be at the top of one's game." Other synonyms for this phrase include "be on one's game," "be primed," or "be in fighting form." Alternately, one may use idiomatic expressions like "have one's ducks in a row" or "have one's house in order" to convey the same idea.