please correct my sentence

I'm so sad because my winter vacation will be finished are going to over soon
I don't know what to do during the how to utilised vacations.
I think thought that I have to will study hard, so I have been am studying hard but I'm so anxious because I think It is shortage.
If my vacation is will finished, I will have to do best more than now.

Please correct my sentences. Thanks.

I'm so sad because my winter vacation will be finished ending soon.  I don't know what to do during that time. the vacation. I think that thought about spending the time I have to in study. hard, So I have been studying studied hard. but However, I'm so antsy now anxious because I didn't think It is shortage I had studied enough/much. If When my vacation is overfinished, I will have to study even more/harder do best more than now.

please correct my sentence

I'm so sad because my winter vacation will be finished soon.  I don't know what to do during the vacation. (< Perfect!)

I think that I need to study hard for when school starts again. I have already been studying hard but I'm anxious because I don't think I've studied enough.
If my vacation is finished, I will have to do best more than now. (< What do you mean by this last sentence?)

I hope this helps!! ^_^

Please correct my sentences.

I'm so sad because my winter vacation is almost over.

I never know what to do during vacations.
I think that I have to study hard, so I have been studying hard.

I am still worried, however, because I still do not think that was enough. 

If my vacation is finished, I will have to do best more than now*.

*I did not understand that.