同学你好，该知识点来自沪江网校《BEC商务英语初、中、高级连读【开学季专享签约班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。

同学好
During the past three years, I have learned a wealth of professional knowledge, all said （这里应该用动词的现在分词，或者前面加一个连接词，使其变成一个句子）making study serve（the或者a） practical purpose, so in my spare time, I often participate in some social activities,（缺少连词） knowledge competitions with my partner together（删掉together）. Although we didn't get a high ranking in the game（这里的game其实指代不太明确，建议用词回指一下前文提到的活动）. （这里应该用逗号，请注意标点符号，一不小心搞错了会变成语法错误的~）I think the process was far more important than the result. Because in the course of the game we can not only exercise ourselves（exercise一般指体育锻炼哈~~）, stimulate our own talents,（缺连词） enrich our own experience, but also（but also应该和not only并列，前面的not only 连接的是动词短语，这里的but also也应该连接名词，不能用不定式和介词短语）  from the opponents（换成competitor） to see our
shortcomings, and improve ourselves better（improve和better的意思重复了） in the coming days.
希望有所帮助