I would recommend taking individual exams in the
following order:
Routing (640-901) BSCI
Remote Access
Switching
CIT
The reason I say this is that the routing exam is a
pain in the ***, and probably the hardest exam out of
the four. Also, I have heard that in order to pass
the foundation exam, you must pass all sections of
the exam (about 150 questions)...a failure in any
of the routing, RA, switching sections will result
in you NOT passing (not sure about this, just something
I heard).