Here is some practice factoring trinomials using FOIL.

http://www.mathwizz.com/algebra/help/help3.htm

Here is some practice factoring difference of squares:

http://www.purplemath.com/modules/specfact.htm

This excellent Khan Academy site give extra practice in factoring:

https://www.khanacademy.org/math/algebra/polynomial-factorization/factoring-quadratics-1/e/factoring_polynomials_1