I want different sets of questions on financial accounting,cost and management accounting for free. I am a teacher in this area

You can Google for this online as easily as we can. If I had a bunch of sets of questions that I'd taken my time to work out for me to use, I don't know that I'd want to be just handing it over to someone after all the time I spent on it, especially covering that many different topics.

If you're a teacher, you should be able to come up with questions. A difficulty here is that no one else knows how you teach, what things you want to stress, how you want to ask your questions, what topics you're covering... and for that matter where "in this area" is.

I think your best bet is Google. There are online textbooks out there, and some publisher sites have review questions for the books they publish, though those usually suck.

Accountingcoach.com

As a teacher you must have many text books available to you and has you have internet access you can search on many topics. Don't be lazy do the research yourself, in a any case if you research the questions asked here you will find many variations on these themes