Here is an list of Practice tests for GMAT that I've found over time. I've also mentioned some remarks for each one in the list for everyones help.
Free= Free practice tests available
Signup=Singup required for Taking tests
CAT = Computer Adaptive
Here is the list (please help making it a bigger list by adding on)
Gmatprep (free, signup,CAT)http://www.Manhattangmat.com
I hope this does help people. These are the ones i've tested and I thought were really good. Do let me know if there are others. I shall definitely give them a try.
Btw, my test is schedule in May and I'm planning to gear up big-time cuz my traget is 750