Just let me add to Paul's advice. Regardless of what the company told you or what your student said, you need to continue with your initial assessment of his linguistic skills, further probing his errors. Once you encounter errors, annotate them and reflect on them afterwards, enhancing your curriculum to better meet his needs.
Visit the company's web site to get a better idea of what they do and utilize this new knowledge to your advantage, taking advantage of open-ended questions to further measure his proficiency in the target language.
Ensure that your lessons are interactive and keep his motivation level high, as he may be tired after his day at work. As you are preparing him to function effectively with his colleagues, you might want to incorporate role playing with them or better yet, give him tasks to do that involve getting to know his coworkers better. This strategy should greatly enhance his acceptance rating throughout the office.
If you have further questions, please don't hesitate to contact me.
Eric Paul Monroe