Just don't worry. Give your exams without any pressure.
When you work in any organisation, there is different type of work & different methods / software etc. Your collegues will help you, you will be provided training & by working you will learn in 3-4 months. I have seen even people with 10+ years experience, need to learn things when they join new organisation - thanks to system/processes.
You will get some good advises for interview but believe me, your attitude & luck helps more in getting selected for a job. Will ask some 4-5 questions max 10 question & than no much technical questions.
Also major thing is having knowledge & application of the same for given situation is two different things.