Most people consider the George Washington University ID Board Review the one and only board review (although other institutes will lead some as well). Lead by the "giants," in the field, this course has been said to be very helpful for initial Certification and recertification.
Closer to when the course occurs in August they post weekly questions that you can perform. The Q+A (question bank) can be purchased separately.
About the Course | Infectious Disease Board Review Course
Other resources are other there (I think Mayo and Harvard/Partners has a course/materials not sure if they have a question bank) including a few Twitter feeds which post board style questions (WUID_Qx). I don't think you can go wrong with the GW Course above.
Good luck.