First of all, graduate students can apply for the title of intermediate mechanical engineer two years after graduation, and choose which direction to apply for. According to Beijing regulations, published defense papers must be written by independent authors, and joint papers cannot be used. In addition, China Mechanical Engineering should be the core journal, but the third author is of little use. What's more, you published it at school, which is not included in your work performance. The defense thesis may not be published, and it may be a thesis, an invention patent (non-utility model or appearance), a project plan, etc.