Dual certification is excellent. It greatly increases your usefulness to a school since you can teach in more than one area. Principals like that since very often the number of teachers do not fit in with the number of classes that they have. They like to have swing teachers.

Math and secondarily Biology are the best areas to be certified. Both of those and in particular Math are shortage areas. It is not likely however, that you will be able within a four year degree to meet the education requirements and the subject requirement for dual certification.

Best of luck.

http://www.teacherscount.org/wannateach/

good luck 🙂