Begonias, browallia and vinca belong in the seed grower's "challenging" class.

Less challenging classes make it easier to obtain the grades required for continued athletic eligibility.

Pioneer's accelerated program allows students performing at a high academic level to take more challenging classes.

Eva Norvind, who has a master's degree in health education and counsels sexual deviants, calls the class one of her most challenging.

Conversely, in schools where courses may not be weighted, some students select less challenging classes to score easy A's.

They are often assigned to the most challenging classes because of their lack of seniority.

I would expect that in such a challenging class outlines are a necessity, to understand the literary work and to pass as well.

For his freshman year, he chose the most challenging classes, including Chemical Principles, even though he had no chemistry in high school.

The students held their teacher in high esteem because she always made the class interesting and challenging.

In addition to challenging class work IB stresses independent thinking and community engagement.