Dear all,

just started to prepare for the GMAT and did all math questions (DS + PS) in the OG 11. I kept track of my misstakes and it seems like that I have problems with

a) inequalities
b) number properties

and in general problems with the last 30 DS problems (126 - 155) in OG 11, only got 50% right. :-( I suppose the last problems in OG 11 are more difficult than the ones in the beginning?!

Do you have further source recommendations for further DS and PS math questions? I really want to have the hard stuff (even if it is harder than real GMAT, which I do not believe from OG 11 math).

Thank you very much!

Best regards

Mike