Maybe you should prepare two kinds of resumes: first, the cover letter at the top, then the resume, and your certificate at the bottom.

This resume is mainly aimed at companies that want to recruit fresh college students to return to the company for training for a period of time. Second, the cover letter is no longer important. Your resume doesn't need that many pages, but it's better to be within two pages. The focus of your resume is to reflect what you actually did and what the result was.