I'm thinking about purchasing Jeff Sackmann's set, but I'm not quite sure which package would suit my current level.
I've been learning for the GMAT for about 3 months now, I worked through all the MGMAT guides
and the OG. When I took my first preptest, after I had worked through all the topics in MGMAT I scored a 42 in the quant section, after that I made the mistake to focus too much on the advanced type of questions, while I still had some deficiencies in the basics. Did another preptest and scored a 42 again. Lately I've been going through all the concepts again, working on topics which I wasn't that comfortable with yet.
Now the last three weeks I had to stop with my GMAT prep because I was writing exams, but now I gave myself 2 months in which I ca fully dedicate myself to the GMAT, I want to take my test in mid april.
My actual question now is, to those who have used Sackmann's sets, which sets are appropriate for someone who doesn't start from 0, but already has done some work. What is the difficulty of the "Fundamental Sets", is it similiar to the easier to average difficulty on the OG problems? And what is the difficulty of the "Challenge Problems"?