graduate：过去时,graduated.
degree course:请加说明是什么本科课程.
I have been worked in XX company limited as an accountant since 2006.
用了被动语态,应该去掉been.有限公司为limited company.建议去掉limited,因无关你的表达.既然你需要英文面试,那你工作过的公司或工作是否有外贸的成分,加上这方面的说明会加分若有.
complet是否打少了一个字母?应为complete.
get good computer skill and good communication with my colleagues.my personality is open,get good team spirit.
建议如下：get good computer skill and go on well with my colleagues.I carry a steadfast,patient and careful attitude and pay much attention on team spirit.
I believe that your firm will be able to provide me with the right environment for me to excel further.
建议：如果非要加上此句,改为I believe that your esteemed company have the well environment and I can get progress if I have the honor to work in it.
第二段to并不多,整篇还是很通顺的.
会计工作讲得还算详实,税种只是一句带过,可以列清你熟悉的税种.
