請幫我改這篇英文

I passed the exam 2 months ago, but the result is not very good. I think if I had studied hard, I could have got a high score.

My class is going to hold a Christmas party, where all of our classmates have to bring a present each for the Christmas gifts exchange games.

兩個月前, 我通過了測驗, 但分數不是很好. 我們班會舉行聖誕節派對,
所有同學都要買一份禮, 因為我們會互相交換禮物.

圖片參考：http://l.yimg.com/f/i/tw/ugc/rte/smiley_1.gif
peace is always beautiful

2009-12-16 02:45:15 補充：
a high score 跟 a higher score 文法上都講得通, 但意思上應有分別.

你話你成績唔係噤好 e.g. 50分 ("緊緊合格") , 而取得 a higher score 就可以係指"較你原本的分數高D" e.g. 60分, 高少少都可以係"高D", 因此 a higher score未必一定係指"好成績", 但取得 a high score 就係"高分數", e.g. 80- 100 分. 所以要睇下你想表達甚麼意思才可以決定用 high/ higher.

2009-12-16 02:48:16 補充：
既然你假設如果你當初有努力過的話, 我就大膽估計你係想取得 "好成績" ( a high score).

2009-12-16 19:32:17 補充：
'ago' & 'before' (如果指定時段) - 意思並不相同.

http://www.bbc.co.uk/worldservice/learningenglish/grammar/learnit/learnitv350.shtml

2009-12-16 19:33:45 補充：
'before'- at a certain time before then

"Ago" always counts back from the present time (由現時這一刻倒數一段時間). Note that if we are counting back FROM A PAST TIME (由一個過去的時間點倒數), before or earlier or previously are used, not ago:

2009-12-16 19:34:36 補充：
e.g. 1

Last year I went back to my hometown that I had left TEN YEARS BEFORE and discovered that the house I grew up in was no longer standing. (= left home 11 years ago)

上年我返了我的家鄉, 之前一次返去己經是10年前的事… (由一年前起計無返10年, 所以相距現在, 即離開家鄉己經有11年)

2009-12-16 19:35:26 補充：
e.g. 2

Last year I returned to my hometown that I had left TEN YEARS AGO and discovered that the house I grew up in had been demolished (= left home 10 years ago)

上年我返了我的家鄉, 至今己經足足10年無返過去 … (所以係無返10年)

I passed the exam two months before, but were not with very good marks, I think if I had studied hard, I would have got a higher score.
My class is going to hold a Christmas party, all students must buy a present for exchanging with each other.

1大細楷:句子開頭/我/節日都用大楷,交功課唔錯得
2get/got/got,forget/forgot/forgotten唔好搞錯
3分數用高低形容,唔係用好壞
4虛擬句要真實冇發生,所以用higher會好d,因為高係冇標準嘅.
5後面我覺得兩句重覆,所以改咗.

I passed the exam 2 months ago but the result was not good. I would have done better if I had study harder on it.
Our class will host a Christmas party during Christmas, while each one of us is asked to prepare a gift for exchange purpose.

I passed the exam 2 months ago, but the result is not very well, I think if I had studied harder, I would have got a better result.
There is a Christmas party going to take place in my class, all of the classmates must buy a present because it is a traditional thing to do during the Christmas called ‘Secret Santa’, what happens is that on the day everyone will be exchanging presents.

兩個月前,我通過了測驗,但分數不是很好.我們班會舉行聖誕節派對,所有同學都要買一份禮物,因為我們會互相交換禮物.

I had passed the examn 2 months ago, but the score is not very good, i think if I had studied harder, I would get a better score.

Our class is having a Christmas Party all of the students have to buy a gift, because we are going to exchange gifts.