There was once a day I attended some courses after college.
I sat for the exam, although, it wasn't my first exam experience, but I had a little hitches with memory.
Trust me, memory failed me.
Sincerely speaking, in whatever it is you're going as a human being, you need memory.
You could record your daily activities with a perfect memory.
Even your spouse won't take it lightly with you if you can't recall his/her birthday dates, phone number as well as some basic information about your relat.