2nd GMAT Attempt:500 (Q33 V28) Extremely Confused/Frustrated

Hello experts,

I'm extremely frustrated, tired and confused. I wrote the GMAT yesterday for the second time and scored a 500 (V28 Q33). The first time I wrote it, I scored a 460 (Q19 V28).

The first time I wrote it, i was anxious, nervous, had severe timing issues. I obviously had gaps in content and took the advice to focus on the basics and timing. So, i felt I did this - I felt confident, calm and happy about writing the GMAT yesterday. i felt my quant (specifically DS) was tough but I felt I preformed really strongly on verbal - and evidently, that wasn't the case.

Study Materials:
- Manhattan Guides
- Stacey Koprince articles (in it to win it, all about timing, devising a study plan etc)
- OG12 and OG Quant 2nd Ed.
- GMAT Quantum video guides (Dabral's the best!)

The only content areas I didn't spend too much time on was coordinate geometry, combinatorics and probability. I felt this was justified considering that my score target is 650-680 and understand these are very niche content areas.

On the ManhattanGMAT tests, I consistently scored between 640 and 670 with my verbal score fluctuating between 35 and 44. My quant score had steadily increased from 33 to 42.

I did two GMATprep tests; both of which gave me completely different results 530 and 560. During both tests I felt somewhat anxious during the tests and dismissed my math score (around 33-35) as not a true reflection of my abilities.

When I look at my scores, i'm really confused for the following reasons:
1) I'm a native english speaker and feel verbal is my strength; on MGMAT tests, OG questions I can answer SC, CR and RC questions in good time and score nearly perfect in every scenario.

2) Quant has always been a weakness of mine and I've painstakingly worked to improve it. Although I have improved, the real scores never seem to mimic the scores I achieve on practice tests or how I feel about practice questions.

In terms of options/next steps:
- I cannot afford tutoring
- I'm extremely self-motivated and know I can (and have) allocate dedicated time to GMAT studying
- I feel I can do this on my own - but I just need some direction as to what I can do next.

I feel confused because my practice scores never seem to match my real scores. Before I attempt it for the 3rd time, I'd really like to be confident about my approach. Any advice or thoughts are appreciated.

Bhavin