OGs of the GMAT test game

The quant tests you'll usually find(even on official software) are either too easy or too broad in terms of their subject matter as compared to the actual exam.

GMATclub quant tests are a very good recreation in terms of their difficulty levels and subject matter.

Their questions are not heavily formula based but are genuine testers of conceptual understanding and logical application of the same.

I found their Verbal questions to be a little off the mark of the best available and there is scope for improvement in recreating similar content to the actual exam.

GMATclub's interface is a very good recreation of the actual exam software.