Writing prompt: Thanks for Parents

Student essay:
Dear mom and dad,
I'm now having the most important exam in my life.I can say nothing but thank to you both on this special occasion because words are failed when I think of the love you have shown on me.During the essential year,I spare every effort on study.So I get on well with the exam which I used to expected.I hope you can set your mind at rest.
After the exam,I will intend to do homework which I was seldom to do to help you.I would like to help cleaning first.What's more,it is cooking that I want to learn best.I mean to learn it and cook some great dishes for you.
Dear parents,everything is going on well.Don't be nervous about me!
Best wishes,yours Lihua

Corrected essay:
Dear Mom and Dad,
I'm now having the most important exam in my life. I can say nothing but thanks to you both on this special occasion because words fail me when I think of the love you have shown me. During this essential year, I spared no effort in studying. So I did well on the exam which I used to expect. I hope you can set your mind at rest.
After the exam, I intend to do housework which I seldom did to help you. I would like to help with cleaning first. What's more, it is cooking that I want to learn best. I mean to learn it and cook some great dishes for you.
Dear parents, everything is going on well. Don't be nervous about me!
Best wishes,
Yours Li Hua