Are these Phrases written correctly?
I'm trying a new project of keeping my school planner and assignments written in Japanese. I can google to find/learn certain words but the only problem is I don't know if it's 100% correct or if there would be a better way to phrase it. Any help or comment is appreciated. ありがとうございます.

ボトルロケットのしめきりは16年4月25日.

I'm trying to write "The deadline for the bottle rocket is April 25, 2016."

明日はテストがあります.

I'm trying to say "There is a test tomorrow."

I'm also wondering if just using the kanji 稽古 by itself would be okay as a way to say practice/study.

Question

Are these Phrases written correctly?
I'm trying a new project of keeping my school planner and assignments written in Japanese. I can google to find/learn certain words but the only problem is I don't know if it's 100% correct or if there would be a better way to phrase it. Any help or comment is appreciated. ありがとうございます.

ボトルロケットのしめきりは16年4月25日.

I'm trying to write "The deadline for the bottle rocket is April 25, 2016."

明日はテストがあります.

I'm trying to say "There is a test tomorrow."

I'm also wondering if just using the kanji 稽古 by itself would be okay as a way to say practice/study.

Answer

I think your answer is almost perfect!
The only thing I noticed is  you could change the sentence to say 
''ボトルロケットの締め切りは16年4月25日です''

稽古 means a certain practice of study and sports like sumo.
We genually use this Kanji 練習 practice / 勉強 study

Answers · 2

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