This app "Mochikana" (for iOS, Android) is very good. I recommend you to play it, especially the Katakana writing course. Because your writing Japanese characters are so hard to see. There are many students who cannot write their own names correctly even after studying Japanese for more than a year. People who can't even write their own names correctly won't be able to pass the entrance exam for vocational schools, and that will be you in the future.
