TOEFL- To Be Or Not To Be

OMG.(Note: It's OK to write like this in your blog. Just don't use these internet-style abbreviations in your test.) I'm so terrified about the day that I will take the TOEFL.

(Suggestion: I'm terrified (or afraid) of the fact that I have to take TOEFL.)

Note: "so... that..." is used to indicate a cause and effect relationship. E.g. I'm so terrified of the dark that I can't sleep. "Taking TOEFL" and "being terrified" don't form this relationship.

I know that I need to improve my English skills but I dont know if I have to take a toefl preparation or just study for myself. (Suggestion: I can't decide whether to take a TOEFL preparation course to study on my own.)

the problem is The institution institute that offers the course I wanted want to take do that course took me an english interview interviewed me yesterday (or last week, etc).

Surprisingly, that was really easy. [so I was thinking that institution was really bad, because I approved it,](I'm afraid that I don't quite understand this part.)

I know that I dont have the enough knowledge, so I dont know what will I do, (Suggestion: Right now my English isn't good enough to take the test but I don't know what to do.)

Do you know what I have to do? (Suggestion: Can someone tell me what to do? What do I need to do? What shall I do?)

Toefl TOEFL- To Be Or Not To Be...

OMG. I'm so terrified about the day that I will take the toefl TOEFL. [Use (.) "period", not (,) "comma". I know that I need to improve my English skills but I don't (Need an apostrophe) know if I have to take a TOEFL preparation or just study for myself(.) "period" The problem is the institution that I wanted to do that course took me an English interview, that was really easy so I was thinking that institution was really bad, because I approved it(.) "period" I know that I don't have the enough knowledge, so I don't know what will I do (.) "period" Do you know what I have to do?

Note: I'm pointing out the obvious ones in your paragraph: puncturation and captitalization. Because TOEFL's writing section is going to test your ability to write in an academic setting, you need to establish a good writing habit.