How should I study for FYBMS Business Communion for my internals? Any proper website where I can get past papers for reference?

You dont need past papers to solve and consume your time. You should keep brushing up from your notes, try to solve some examples for practice and just simply revise them for internals. Try to note down important stuff for remembering. Make sure you're confident, calm and relaxed to give your best shot. Kindly refer below link for reference examples asked in exams. http://www.bms.co.in/fybms-sem-1-syllabus-business-communication/ http://www.allonlinefree.com/business-communication-notes-pdf/ All the Best for exams.

Taking cues from your internship experience could be a beneficial idea as you get to learn so many things on communication first hand. there are many online resources where you can look for study material..you can explore the link below as well https://www.saylor.org/site/textbooks/Business%20Communication%20for%20Success.pdf