Main Question: I retook my GMAT because some consultants have advised me that my quant score was low. They also advise that I raise my score 10-20 points. I retook my GMAT and scored a 51 on quant but unfortunately my verbal score took it hit. Do I need to retake again or would most of my target schools look at the subscores individually?

Asian American Male *Born in U.S.*, 3 years of work experience but planning on applying after 4 years of experience (Looking at R2 in 2018)
B.S. Chemical Engineering GPA: 3.78/4.00 from University of Oklahoma
Currently working for a petrochemicals company (Think: ExxonMobil; DOW Chemical; BASF etc) as a Technical Sales Engineer
GMAT 1: 710 (91 percentile) Quant 48 (71 percentile-ironically low for an engineer I suppose) Verbal 38 (85 percentile)
GMAT 2: 710 (91 percentile) Quant 51 (97 percentile) Verbal 35 (76 percentile)

Brief Background: I work as a technical sales engineer for Chevron Phillips Chemical Company. I work with commodity plastics, specifically Low density polyethylene and high density polyethylene (recycling codes 2 and 4 on plastic articles). In terms of job functions, there are a few: Responsible for developing new products along with R&D (We field interests from customers as to what products they want us to develop and once developed, we are responsible for conducting trials of the new material at the customers, etc) ; help troubleshoot customers' issues with our products; attempt to increase product volume with customers; technical marketing (creating technical literature for customers).

I think my goals with a MBA are two fold: 1) short term: Over the past few years, the part of my job that interested me most was the product development aspect. I would like to utilize my MBA to help me understand how to make the business decisions and analysis in terms of managing the product portfolio as a product manager. I'd like to understand how to get that business overview when determining what products to add and what products to sever from our product slate. 2) Long term: As i mentioned, I work with commodity polymers. My goal and the reason I became a chemical engineer has always been to try to promote the use of alternative energy in today's world. I would eventually like to start my own company which would deal with specialty polymers that have alternative energy applications; for instance, a company that can be focused on researching and commercializing a speciality polymer that can be used in solar fuel cells to promote the effectiveness of solar power.

Volunteer Experience:
1 year Big Brothers Big Sisters Organization
1 year member of Lions Club
1 year volunteer at Nonprofit Homeless Shelter
1 year literacy tutor for illiterate adults
1 year engineering assistant teacher for a technology program for high schoolers
1 year of local city's park and recreation board

Leadership Experience:
1 year as Treasurer and 1 year as secretary for Society of Plastics Engineers
1 year as President for New Hire Network
2 years as debate coach along with helping start a debate program for high school

(There are other volunteer/leadership experiences from college that I have neglected to post at the moment)

Some of my target schools - albeit I need to do more research into some more schools -
Northwestern
M.I.T.
Berkeley
Columbia
Duke
NYU
U of Chicago

From a self-reflection, I want to say that my weakest areas are leadership experiences and GMAT.

Please advise and I appreciate the feedback!