First of all, there is something wrong with your question. SCI includes periodicals, and the main body of influencing factors is also periodicals. A simple document has no influence factors. The impact factor of a journal is the number of times its published articles are cited in two years divided by the total number of published articles (in fact, it should be weighted, here is a brief explanation). If this number is high, it means that the articles published in this journal have received a lot of attention and the grade of the journal is relatively high. To check the impact factors of journals, you can click the journal name in Pubmed and you will find the corresponding link, or you can directly go online to find an Excel table, which lists the impact factors of thousands of Chinese journals in detail. As for how many times an article has been cited, you can use ISI database or GOOGLE, but I don't think it is very useful.

I don't know where the defects of the postgraduate entrance examination are. In fact, if you use macro keywords such as HIV, you will get thousands of documents. This is not literature retrieval at all. Meaningless. You should use limits and some logical words.