• If you think that you have done well in JEE Main and you're expecting a good rank, then be happy, and confident that you will score well in JEE advanced too. But, if you are not satisfied with your performance in JEE Main, don't worry, you can still do it you really want to. Just trust yourself and don't be tensed.
• Do not choose new chapter/topic. Just review all the chapters that you practiced in last two /three years. You need not learn new things in these  days.
• Do not practice the same type of questions, more than twice as JEE advanced is an exam of new questions.
• If you think that you do not recall things very well and need revision, then refer to the same notes/books, covering the topics or chapters, that you have studied from before. As the day passes,try recalling things briefly.
• Many people think that an average student (who scores below 150 in JEE Main) can't do good in JEE advanced. As syllabus, paper pattern, marking scheme of JEE advanced is entirely different from JEE Main, it is the aptitude that matters. So you need to extremely hard these days after JEE Main to do well in JEE advanced.
• Believe in yourself. Trust the efforts that you have put in throughout the JEE advanced preparation. Getting tensed a week before the exam is not a good idea. Keep your mind free and possibly do things which relax you, like listening to music, watching inspirational movies, playing cricket etc.

Well thanks for asking. I'm hoping you have scored well in your JEE Mains.

Now is the time to relax and revise. Revise the important marked points in your class notes and questions and practice from previous year papers as well.

All the best for your exams.