Really good source to target Q49+

I got 6 months access to GMAT Club tests by purchasing e-GMAT course.
I found GMATClub Quant tests a bit tricky. you'll have to be thorough with the concepts to apply these to the questions in under 2 minutes.
If you would like to build your concepts then GMATClub forum is an awesome resource to study and prepare your basic Quant skills. Once you have got exposed to all the topics then its time to asses your skills and GC Quant tests is the most comprehensive test platform to assess and improve your abilities.
These have been my GC Test scores:
Q1: 50
Q2: 42
Q3: 45
Q4: 47
Q5: 44
My Actual GMAT quant scores:
GMAT1: Q48
GMAT2: Q49
GMAT3: Q49
As you'll notice a consistent Q45+ score on GMATclub tests will translate to Q48+ score on actual GMAT exam.