Quantitative | Timing issue between scoring Q50 and Q51

Hi Experts,

I started preparation for GMAT three months back, and I scored Q49 in the very first GMAT Prep.
In the next two months, I solved OG (twice), Quant review and MGMAT mocks. I took the second GMAT prep and again scored Q49
Discouraged I started practicing GMAT Club tests and my results have been Q51,50,50,50,51,50,50.

The problem with my inconsistent score is that by the end of each test, I find myself facing time crunch, and it results in silly mistakes in the last few questions and
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