Hi,
Firstly, I'm sorry to hear about your score. If you could de-brief more about your preparation that would be great.
Keep your spirits high and never loose hope. I guess you are more determined now and mould it to reach your target score.
Revise all your concepts again and take a mock test in a week from now.
Access your test results and areas to improve, in correlation with the actual GMAT, which you took on 16th.
Maintain a log of everything you do and keep concentrating in the low scoring module, until you feel confident.
As i Could see, Maths is not an issue with you. However, Aiming at 51 is not a challenge and its plausible.
Coming to English, as you might be a non-native speaker, keep taking as many tests as you can and maintain error logs.
Don't repeat the mistakes again.
I suggest you to complete OG 2016 atleast a couple of times.
If you still feel concepts are lacking, enroll for E-Gmat verbal course(Its highly rated for English).
Complete the course at the earliest. Whilst, taking tests they provide.
Think for a plausible date by when can you complete these tests & Course. (Not more than 45 days - you will loose interest again).
Take at least another 10 mocks before your next attempt.
Boom!!! - Your Target score.
Note: I am also a co-applicant and aiming at an higher score. This is just from my experience with many friends.
Kudos please if found helpful.
Cheers,
Harry