Hello

Just wondering if the 25 bonus questions online for each of the strategy guides are too hard or is it just me ?
Some of the topics completely stumped me.

What is the benchmark percentage one should score on these ? My tests have gone as below approx. with timed sessions of 50 mins for each.
% of Correct questions
80% CR
60% Word Translations
90% Number properties
75% FDP's

I have given my GMAT before ( 650 ) and dont think the level is that tough as that of MGMAT Question Bank. Shall I expect similar questions for mGMAT online tests ?
It's good that the questions are challenging but I would just like to know :D

Any help would be appreciated

Thanks