Means or methods of learning and acquisition of english

can any one correct me below letter..... please
Explain briefly what were your methods or means of learning and acquisition of English.
"I respectfully present the following justification of my English proficiency.

From elementary school onwards, English was the medium of instruction in our core subjects, namely reading, writing, mathematics and science.

I studied at University of Pondicherry, an accredited Engineering school, and I graduated with a Bachelor degree in Mechanical Engineering. The official language of communication was English. All symposia, seminars and similar discussion groups were always conducted in English.
I passed all English subjects with above-average grades.

After my graduation, I started working as a Quality control engineer with Ms.xxxx Private Ltd., which is one of the reputed manufacturers of Boilers and Pressure Vessels in India. I was required to communicate in English with employees, higher management as well as our customers.
After working for around 2 years with the above mentioned organization, my aim is to work in a giant International organization, hence I moved to xxxxGroup, Singapore based firm having their operation in India and deputed me to an international projects in Singapore and Malaysia. I was mainly responsible to plan, organize, implement and control the project activities. My excellent communication skills and advancement in English were an added advantage for me to cope with these changes in the work culture and work environment.
Also I have been sent offsite often for providing technical supports and trainings related to the projects; hence my technical skills and English proficiency helped me to perform efficiently and effectively throughout my carrier.

Of course, English is the only medium of communication used during interactions and project presentation with our international clients.
As a professional, interacting with a range of employees in various countries, I consider myself to have a high level of proficiency in both spoken and written English.