This is my first English essay

It's my first time writing an English essay 
Today is Saturday, it's very hot outside, up to 32 degree C,
I am chatting with my Mum while watching a TV program. 
Lately, I feel that I waste a lot of my time,
In September, I have to take one subject of CPA exam for the last time. Last year I thought I would pass,
however the result was very disappointing. 2 years ago, the CPA exam included an English test, you have to answer some of the questions in English, the English score is worth 22points out of 100points,
(This is)it's a huge challenge(or disadvantage) for me, because I learned English by myself from college graduation.
I learned Japanese as my first foreign language, also, I am a multilingual as I speak Korean at home while i speak Chinese outside or at work. (you are bilingual when you speak only two languages but multilingual when you speak more than 2 languages)
this seems a little complicated, I hope I have not confused you, ^^
anyway, thank you so much for patiently  reading and correcting my poor English.  you must be a kind person.
see you later, have a good day~

my first time of correcting too. :-)