Dear Ms Outram:
If you ask me what score I should deserve in the oral test, I would like to say that at least I could pass this test and the score might be between 2+ and 3. Considering the fact that I did not express my best potential in this test for some reason, I guess I could only deserve this relatively low score, saying between 2+ and 3 in this semester.
（如果你问我我应该在口语考试中得到什么样的成绩,我倾向于回答说至少应该及格,分数在2+到3分之间吧.考虑到我在口语考试中由于一些因素没有完全展现我最佳的潜力,我觉得我这学期只配得上2+到3分这个较低的分数.）
Whatsoever, I regard that this score for me is appropriate and fair enough so far, and I do hope to get higher score in the next term through my efforts. I give you my word that I would spare no efforts to get well prepared for the oral test in the next semester. By the way, I would like to thank you for the fact that you always treat me nice and give me higher scores in other tests than the oral test which really encourages me a lot.
（不管怎么说,我认为这个分数对我而言是合适且足够公平的,并且我确实希望在下学期通过自己的不懈努力得到一个更加理想的分数.我向您保证,在下一学期中,我会不遗余力的准备好口语考试.另外,我要感谢您,因为您一直待我很好并且在其他科目中给了我比口语考试中更高的分数,这给我很大的鼓励.）
You know to what degree I can do in the tests right now. In the next semester, I hope that you can see my progress and enjoy my speaking in the oral test.
（您是知道我现在能在考试中发挥出什么样的水平的.在下一学期中,我希望您能够见证我的进步并且在口语考试中欣赏我的口语.）
PS：我想了一下,你大概就是想说这些吧,帮你整理的更通顺一些,你可以比对着中文看一下.
希望对你有所帮助~~~O(∩_∩)O~