Interesting the mistakes/difficulties we seemed to have.
Grand Mère was one I got wrong because I didnt use the accent, although it was in the question! - My eyesight is poor.
The plus que parfait question I could not answer without a sneak at Bescherelle to confirm what the tense was, I still had no chance of conjugating it though!
The subject/object ones really got me thinking but i did pretty well.
The set of questions where you were warned that the person was feminine tripped me up, I realised that I only needed to consider this when she was the subject and then added an e to each verb ending in é, now normally I would not evenhave thought to do this, just as well as I was wrong in most cases. That was the only section where I could not with a lot of effort remember the rule/s that I had learned, perhaps I didnt cover it or had problems understanding.
I also masculised two nouns that I knew were feminin, oreille and armoire, by that time I was trying to be too clever, I knew that they would use the possessive pronoun mon, ton reasoning that they commenced with a vowel although I was never taught this so I assumed thats why, so I thought "ah they are trying to trip me up here, it must be un armoire and un oreille"
Congratulations to you on your good results and especially remembering lessons learned at school, I had to start from complete scratch in my 40's having got unclassified at O level (for turning up and signing my name on the paper) in the days when pupils were allowed to fail.