Questions 1 and 2 need to be worked on. For question one, the deck was okay but your explanation needs work. All you really did was recite the effects of each card in different words, in order to pass this test you need to explain how cards interact well with each other, how the deck you made counters the meta, and what surprises you can have to throw your opponent off balance in the duel.
For question 2, you didn't really make a hand control deck, you added 3 don zaloog to a not so stun stun deck. Even in the explanation you didn't talk about how the decks disrupts your opponents hand, you talked like you were explaining your stun deck from question 1.
The gravekeeper's deck fix was fairly well done, you left a few things out that can really help a slower deck in the current format but for the most part it was well built.