510 -> 470 after 6 mnth preparation, Down but not Out.

Hi Guys,

This is my first post on GMAT club . I am totally devastated after my 2nd attempt today .
After 6 months of preparation my score gone down form 510(Q46, V17) to 470 (Q45,V12) . I didn't expect this much low, expecting at least around 600. I can't figure out what went wrong from my side. I am planning to join either classroom coaching or online interactive coaching who can guide me better than me. But not sure which one will suite me.

Few of my scores
GMAT Prep 1 -> Nov-10 -> 560 (Q47, V21)
GMAT Prep 2 -> Dec-20 -> 560 (Q48, V20)
GMAT TEST -> Dec-31 -> 510 (Q46, V17)

Re-install GMAT Prep
GMAT Prep 2 -> May-5 -> 580 (Q47, V23)
GMAT Prep 1 -> Jun-17 -> 360 (Q06, V28) (Only Attempted Verbal)
MGMAT CAT-1 -> Jun-20 -> 560 (Q41, V27) (Put more concentration on Verbal)
GMAT TEST -> Jun-23 -> 470 (Q45, V12)

After this dismal performance I was planning to drop my GMAT dream.
But how can I quit ???????? I have to overcome my fear.
Again I am pulling my socks and tightening my buckle against my upcoming GMAT.
This time I need help from all the experts and their advise.

I was preparing below materials for 6 months, hardly I practice Quant in last 6 months apart from few qsn practice, still I could not improve my verbal score.
SC -> MGMAT series
RC -> MGMAT series
CR -> Powerscore CR Bible
Quant -> MGMAT series
for Questions practice, OG V13 (practiced 2/3 times each qns), and OG Verbal V2
GMAT Club resources / Tools (Error logs)

Please suggest, I will really appreciate if you guys suggest what is good form me. Also Sorry for making this post big and boring.

Thanks
Anupliku