Is it grammaticaly correct if I write at the beginning of my statement of research

kouroshhI would like to explain why I am thinking believe that my theoretical and practical background is a perfect match for this position.

I recommend the change shown above.

CJ

Thank you for your reply dear CalifJim . Can I also ask what do you think about this part:

I became interested in chemistry because from the time I was in high school, I have been always interested in finding out what is medicine made of and what is the mechanism of their action. I wanted to discover that how every element inside a medicine could contribute to making us recover from sickn

kouroshhI became interested in chemistry because from the time I was in high school, I have been always interested in finding out

The mention of high school is not necessary in my opinion. You've already said 'always' which we can presume includes the idea 'from an early age'.

kouroshhwhat is medicine made of and what i

Thank you again. I promise that this is my final question. Can I also ask what do you think to add below bold part to end of the previous sentences which you already corrected?

I became interested in chemistry because, I have been always interested in finding out what medicines are made of and what makes them work. I wanted to discover how each element inside a medicine contributed to our

kouroshhI promise that this is my final question.

I'll take you at your word.

kouroshhI became interested in chemistry because, I have been always

No comma. And there's a problem with the word order.

I became interested in chemistry because I have always been ...

CJ