I’ve been a volunteer during the three months in the international organization which is called International Science and Technology center
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For three months, I've been volunteering at the international Science and Technology center, an international organization. -------
history, [and] achievements of ISTC to the visitors of International Exhibition EXPO 2017. EXPO
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was held in the capital of Kazakhstan in Astana[,] where our own country[,] Kazakhstan and more than 95 countries [with] 22 international organizations including ISTC
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Beside the projects in the field of future energy, many countries, especially Kazakhstan[,] in order to attract visitors[,] have showed their culture, traditional dishes, clothes, [and] entertaining programs.
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Each country had [had an] [their] own pavilion and international organizations are not exception.
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etc.[ ]were
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[We had] [There was] a small special stand inside [this] [the] plaza with [an] interactive computer where [the] [a] video about ISTC and their partner countr[ies] [y] was played.
From the beginning [till the end] of the exhibition [to the end,] our stand [was] never [was] empty because many people were really interested in ISTC. And now[,] after finishing volunteering[,] I want to thank ISTC for hiring me as a volunteer because I found a lot of advantages in this.
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Firstly, I had a chance to improve my English[,] [speech] because I met a lot of foreign tourists[,] and [talked] [got the chance to speak] with them. I think that speaking with native speakers is more effective than other practices.
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Secondly, [I revieved a] certificate that confirms [that] I was a volunteer[.] [It] has [had] a [good] [great] impact [to] [on] my social life.[ ]Being a social [and] active person is valued in [a] university.
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Thirdly, this summer was [incredibly cool and full of interesting things] [incredible and full of unique and incredible experiences]. During [the] work[,] I met new friends, received different gifts and saw national day performances of several countries. I am eternally grateful to ISTC for providing opportunity to be a volunteer and [I want to wish more achievements in the future as well].
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add "incredible and full of unique and incredible experiences"
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remove and reword "I want to wish more achievements in the future as well"
