If you had to compare the representativeness of the quant questions from gregmat and manhattan 5lb in comparison to the actual questions of the GRE, how close they are?

I have done Manhattan 5lb. Except for statistics chapter and geometry chapter I find rest of the chapter s quite easy. Is it really representative of the actual thing? Also how close are the questions from bigbook and gregmat?

I really need a fixed source to keep doing some problems while accumulating my mistakes.