Correção de Cover Letter

My qualifications include an university degree in Modern Languages and Literature - Portuguese Studies and a postgraduate course in Science of Education.
I have been teaching since 1999 at public schools.
Teaching in different schools developed my capacity to relate well to people from diverse backgrounds, which became a step forward in classroom management.

Estou escrevendo uma "cover letter" e gostaria de saber se está tudo correto! Obrigada ;)
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My qualifications include a University degree in Modern Languages and Literature - Portuguese Studies and a postgraduate course in Educational Science.
I have been teaching at public schools since 1999 .
Through teaching at different schools, I developed a capacity to relate well to, and understand, others from diverse backgrounds, which became a step forward (or an advancement) in classroom management.

Just remembering that when the word that starts with the letter "u" is pronounced as "you", don't use "an", use "a" before it.
Obrigada pela ajuda!