Rectangular solids are presented in many standardized tests as yet another way of testing your visual three dimensional geometric skills.  They are not too difficult, but you must know how to calculate their surface area (S.A.) and their area.
    Here are those two formulas:

    Volume = (length)(width)(height)
    Surface Area = 2(length)(width)+2(length)(height)+3(width)(height)

    Here are some more example questions; if you can answer them, you'll be cool for college;

    (1)  What is the Surface Area of this rectangular solid?

    (2)  What is the volume of this cube?

    (3)  What is the volume of this rectangular solid?