dude...i guess 1 shd be enuf...but generally people(including me

) prefer two test series....i can think of 2 reasons...1. two diff insts will have 2 diff styles of settin the paper..so more styles u practice better ur adaptability....
2nd reason is u get to kno where u stand between 2 diff grps of people....so u can estimate ur position in a much better way
at the end...its ur call mate....
but the imp thing is
enjoy
