The phrase "a tougher set" is correct and usable in written English.
It can be used when referring to a more difficult or challenging group of items, tasks, or conditions.
Example: "The new exam will have a tougher set of questions compared to last year's version."
Alternatives: "a more challenging group" or "a harder collection".
"In every way, I think this is a tougher set of requirements," Mr. Mills said yesterday.
How is it possible that savings accounts with a tougher set of restrictions than the rest of the market are able to compete with more mainstream products?
Mr. Almunia's comments, in response to a question during scheduled testimony at Parliament, highlight the pressure from rival companies like Microsoft to devise a tougher set of remedies with Google.
The proposals are modest, but they represent a rare concession from state leaders, who have faced attacks from parents and teachers in recent weeks over the rollout of a tougher set of standards known as the Common Core.
Legal observers said the shooting near Times Square on Sept. 14 — in which the man being pursued did not have a weapon and there were visible crowds all around — presented a tougher set of facts that could force the city to soften its approach.
"Mr. Draghi appeared to be holding up the possibility of a greater degree of E.C.B. intervention if euro area governments were to commit, at next week's key E.U. summit, to a tougher set of fiscal rules," analysts at Barclays Capital said in a research note.
When the 21-year-old fired his eight-under-par first-round 64 after threatening to set a new major record low of 62 or better, many observers expected a tougher set-up for the remainder of the tournament.
BRUSSELS — More than a year ago, the European Union's top justice official proposed a tough set of measures for protecting the privacy of personal data online.
Mac DeMarco, a Canadian rocker, and his quartet struggled through a tough set.
Choosing a university, a course and suitable accommodation is a tough set of decisions to make.
"It presents a tough set of environmental and smart-growth tradeoffs," he said.
