Here You can find all exqam questions (RedHat, MCSA, MCSE, MCP, VCP, etc)
You can use koovery to open the VCE exam files. You can find koovery here. Or try google.
Pas4sure has a lot of good exam questions you can you to prepare youre CCNA and MCSE exams.
Here you can find a lot of exams:http://certready.blogspot.com/