12th January 12th January 12th

or "12th of January"

The 12th of January The 12th of January

Alternatively: "January 12th"

12th January 12th January 12th

ItToday is my second day here today. Today is my second day here today.

Both are correct, but “Today is my second day here” avoids redundancy with “here today”

ItToday is my second day here today. Today is my second day here.

In factNot long ago, I had spent about a year in Europe as an exchange student. Not long ago, I had spent about a year in Europe as an exchange student.

Starting a sentence with "In fact" implies it will add supporting information or clarification to the previous sentence. Because the previous sentence is unrelated to this one, it doesn't really make sense here. If you had said something like: "This isn't my first experience with communicating in English. In fact, I had spent about a year in..." it would make sense. I would add something about when the trip took place instead (not sure when it was, so I just put something random)

In fact, I had've spent about a year in Europe as an exchange student. I've spent about a year in Europe as an exchange student.

But after coming back to Japan, I have had fewer opportunities to use English, which is why I started using this website. But after coming back to Japan, I have had fewer opportunities to use English, which is why I started using this website.

I feel it's still hard to write English properly even inat the junior high school level. I feel it's still hard to write English properly even at the junior high school level.

I feel it's still hard to write English properly, even inat the junior high school level. I feel it's still hard to write English properly, even at the junior high school level.

Use “at” instead of “in” when referring to a level. Adding a comma before “even” improves readability.

(Also, without any constraints ( I mean, questions in textbooks), I have no idea what to write here.) (Also, without any constraints ( I mean, questions in textbooks), I have no idea what to write here.)

I have the same problem of knowing what to write.