*sigh*
The first paragraph is milquetoast, vanilla when you need pumpkin spice. Sadly, I'd tend to use the same paragraph. Maybe keep it shorter: In response to your advertised THIS POSITION in This Newspaper [date], I am submitting my resume with this letter.
>> For that reason, I feel that I am an excellent candidate for this position and would be a great asset to your organization.
Let's drop 'I feel'. Sure it feels too assertive, but you've got to be.
>>I believe to be successful in life; education is the key and a continuous goal.
Um, wrong use of the semi-colon. It's a comma spot. I'm also thinking 'should be a continuous goal.' But feel free to disagree with that part.
>>The knowledge I have is not easily reflected in a résumé.
Try anyway. A skills section would be a great leader, if you want to focus on your skills. I don't have access to the various links for various formats, but you might want a functional or blended resume instead of chronological. I'm not the board moderator/expert, but I think of a resume in pieces. Always start with your name and contact info. The rest goes in as makes you look best. In your case, it may be: skills, education--if special and recent coursework related to work, employment history. [I saw the continuing portion with your resume after I started responding.]
>>May I arrange an interview to further discuss my qualifications? I am available for an interview at a mutually convenient time.
This seems repetitive. Perhaps: How would you prefer [ or Can ] we arrange a mutually convenient time to interview and further discuss my qualifications?
NEVER EVER put down 'References on Request'. This is outdated advice. Really, if I ask you for references, are you going to say no, and expect me to hire you anyway?
I would think you would put your skills in a bulleted list. The commas ... make it easy to miss stuff. And you might, if you're looking outside the educational fields, need to explain some of the acronyms. Or really, trim them altogether, and show more of what will make you a good salesperson, and less what made you good in education.
DISCLAIMER: I am not the Resume Expert. Further, all communications bearing my handle are my personal views and thoughts and do not reflect my employer or any official communication of my employer.