Recently one of my low intermediate students has failed his job interview because of English. An HR manager asked him two or three simple questions but he mixed up all the tenses in his answer and couldn’t prove that his level was intermediate. He probably got confused. So we decided to spend a couple of lessons on revising the tenses that he needed for his next job interview.
Here is a worksheet for pre-intermediate level that we used. It includes the Present Simple, the Present Continuous, the Present Perfect, the Past Simple, to be going to and will. Correct use of those tenses is a required minimum for any job interview.