If you only dropped 12 beats in the first minute post-exercise
, that would be considered abnormal heart rate recovery
. However, you drop 15 beats which is good!!
In regards to your 2nd question, no, I am not exactly saying that. I would just be able to assume that if you can get to 85% of your maximal predicted heart rate and at the same time exercise at least 8 METS, you have a good functional capacity and are able to do an good amount of exercise without any symptoms.