So do you think Sachmann Challenge Sets--> Gmat Club Math Tests in that order should suffice?GMATClub tests
are more difficult than Sackmann's material. So save the GMATClub tests
I second bmillan01.
The club tests and Bunnel's signatures are the hardest good quality test material so it's better to do them when one is at his or her peak.
Also, If you are scoring around 43, then it's time to identify the concepts you have problem in. You must revisit theory books( such as mgmat) to understand those concepts better and thereafter do a lot of problems of all level( you may use the gmatclub latest level wise distribution), Rinse and repeat for other topics.
After doing so, i am sure your score will minimum jump to 47/48 and that would be the right time to dig into Jeff's challenge sets and followed by gmatclub tests
I've mentioned that in my signatures below.
Fire the final bullet only when you are constantly hitting the Bull's eye, till then KEEP PRACTICING.
A WAY TO INCREASE FROM QUANT 35-40 TO 47 : a-way-to-increase-from-q35-40-to-q-138750.html
Q 47/48 To Q 50 + the-final-climb-quest-for-q-50-from-q47-129441.html#p1064367
Three good RC strategies three-different-strategies-for-attacking-rc-127287.html