請問這兩句英文的grammer有沒有 問題?

1.
yesterday (N)
is (V)
the day that a test of microeconomic, which including 15 marks (O)
Yesterday was the test of micro economic, which consisted of 15 marks (points)

2.
I (N)
had prepared (V)
for test in previously one day (ADV)
I am well prepared for the test in previuos day/day before.

有．
１）First of all, wrong tense.'Yesterday' is a past tense so you should use 'was' instead of 'is'. More importantly, we don't say it this way. It's Chinglish!
We had microeconomic test yesterday and it contained 15 marks.

2) ’之前一日’係'the previous day',同埋用past tense.
I prepared for it the previous day/ the day before.