 Coupled with $12 million from the Carnegie Corporation of New York and the Bill and Melinda Gates Foundation, as well as a long list of other donors, Houston A+ has raised more than $100 million, in total.In 2005, the Charity Navigator awarded Houston A+ Challenge a 4 star overall rating and they have continually received exceptional ratings for organizational efficiency.Through the years, Houston A+ Challenge has been involved in many different initiatives, all aimed at improving academic achievement of students in Houston-area public schools.