2015 Online Tax filing general question

[wicky]

Hello,
For the last 6 years, my family tax filings were done by accounting professionals, and non of them told us that medical expenses can be filed in tax return.My questions are;
1. This year, I am doing it on my own, using an online software, and I want to know whether I can file past medical expenses from 2012 with my this years tax filing.

2. I paid for my professional exam fees in Dentistry to the National Dental Equivalency Board,Canada, an amount close to $15,000 and I have received the tax receipts for them, paid from 2012, and non were filed in previous years. Can I file them with my filing this year.

Thanks and your help is very much appreciated.