The phrase 'work on preparing' is correct and usable in written English.
You can use it to indicate that someone is actively working towards achieving a certain goal. For example, "My team has been working on preparing for our upcoming presentation all week."
We've got to work on preparing kids for employment.
Work on preparing a second major site, Nordhavn, in the docks north of the city, has just begun on land freed up by the departure of heavy industry.
In return, Germany agreed to allow NATO to accelerate work on preparing Ukraine and Georgia for eventual membership, while postponing any further decisions for the incoming Obama administration.
University officials said filing the notice automatically halts the injunction and allows them to continue to work on preparing for the new policy to be put in place.
The agency says it continues to work on preparing its systems to accept the remaining forms affected by the so-called fiscal cliff legislation, the American Taxpayer Relief Act, which Congress passed on Jan . 2
As for professional development, the SMART program provided several opportunities to work on preparing applications, writing scientific and outreach literature, networking, and most vital to this particular experience, mentoring.
Tonight the team worked on preparing the site for planting.
We are working on preparing a scrapbook for Bill to keep.
In a news conference just before 8 p.m. Friday, Lt. J. Paul Vance of the Connecticut State Police described the scene as horrific and told reporters that his officers were working on "preparing a list of positive identifications".
Along the way he made some lasting friendships -- for example, with Jean-Claude Killy, the French Olympic skiing champion, with whom he worked on preparing the 1992 Winter Olympics in Albertville, not far from Mr. Carron's hometown of Yenne.
Some reporters — putting credence in polls, even though they proved spectacularly wrong this month when Senator Hillary Rodham Clinton of New York won the Democratic primary in New Hampshire — quietly worked on preparing political obituaries of Mr. Giuliani in the back of the plane while he and his staff huddled in the front.
