What are differences between various indexing service: SCI, SSCI, SCOPUS and others?
There are lot of questions embedded in your question. Follow the following links:


Difference between SCOPUS and Web of Science
What is the difference between SCI and SCIE?
SSCI-Wiki


Googling further would result in more comprehensive answers. See the related question on the right-hand side of your academia SE page.


  My paper that I submitted to "The Internet and Higher Education" has already gone for review process. Is there any way to get rid of it?


Answer is YES and NO. YES: You can write email to editor and ask for withdrawal. NO: You should not do it.