480 on the first mock GMAT with the exam 40 days away - advice needed

A little back ground - I am an Indian with a full-time job in a reputed company. I have scheduled my GMAT for the 25th of April and have had very limited prep time due to crazy work days. My targeted score is anything above 700.

I started studying on during the first week of FEB with the aim of sticking to Magoosh's 3 month study plan. After 2 weeks of struggling to keep up with their schedule I started falling behind. It would take me around 3 days to finish 1 day of prescribed work.
I also, had to go out of town for work and had some other activities that led me to waste many days.
Essentially, not the best quality time was spent on the GMAT so far.
So I shelved the Magoosh plan and just started solving from the OG clocking in about 5 to 10 problems from each section per day after going through the introductory text.

My involvement in other activities have kept my weekends and some evenings tied up and I only had today to finally sit down and complete the first mock end to end. Only to reveal the disastrous fruits of my efforts so far!

My countdown shows only 41 days left right now and I am relying on the OG and the Magoosh premium membership as my only resources. I also have a copy of the Princeton GMAT 2014 book.

Tomorrow is my final volunteer commitment till the exam, which will render my day wasted (No GMAT studying).

I plan on cramming the Magoosh videos into the upcoming week (Mon to Fri) along with around 5 problems per section and then try taking on the mock again next Saturday in anticipation of an improvement.

Next week onwards, I shall have 2 hours every evening after work, and 1 hour every morning before work to prepare, and also have at least 8 hours free on each day of the upcoming 7 weekends.
This clocks up to about 187 hours of prep that I HAVE to stick to and I want each and every minute to count.

Any suggestions on how to make the best out of this would be most appreciated.

P.S.: I understand the my conditions and current mock score make me a potential candidate for a second attempt. But I do not want to consider this option right now since it would mean sacrificing a lot of planned activities and projects.

Also, a consideration: My main weakness right now is focus and concentration. An interesting RC problem tends to take me down a nice rabbit hole of imagination.
So any tips on that would be much appreciated as well.