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TTP diagnostics are meant to show level of readiness to achieve a particular score goal. So, they are not ideal for estimating your current level unless you are close to ready to achieve the goal associated with the diagnostic. Still, it's possible to use your performance on the diagnostic to estimate your score roughly.
So, I'd estimate your GMAT Quant score at around 44.
Your GMAT Verbal score would be around 31.
Your GMAT total score would be around 620.
Regarding how to approach preparing for the next two months, to increase your score to your goal, you can strengthen your skills in one topic at a time by
- first, reviewing the concepts and strategies associated with the topic
- then, doing practice questions involving that topic UNTIMED until you're achieving high accuracy
- finally, working on reducing the time per question until you're correctly answering questions involving that topic at test pace
By strengthening your skills in one topic at a time, you'll basically drive your score up point by point.
For more on how to achieve your score goal, see these posts on how to increase your GMAT quant and verbal scores.
How to Increase Your GMAT Quant Score: Top 25 TipsHow to Score High on GMAT Verbal