Clarification on Massachusetts law on tax certificates

[Eric Souza]

I'm looking for clarification on specific laws in Massachusetts regarding delinquent property taxes and tax certificates. 

1) True or false... delinquent property taxes are only available to be purchased 1 year after the debters failed to pay?

2) I have read that Massachusetts has a set interest rate of 16% on tax certificates whether they are redeemed in a day, or a year. I've also read that this number could be around 1.25% per month with a total annual return of around 16%. 

3) True or false... all properties have a 6 month redeemable period before the foreclosure process can commence unless the house is abandoned/vacant raw land... then the investor can immediately start the foreclosure process. 

I apologize in advance if these answers are easily available but I have been scouring the internet with multiple different outcomes of "facts". I'm a new real estate agent looking to build a solid foundation the first time around if possible :)

Eric