My exams are finished/over. I'm free now.

I'm waiting for the 1st of January. The new year will start. This day will be important for me because my exams will be finished. I'm impatiently waiting for this day. I will send this message to my friend, " Hi, dear(,) exams are over now I'm free. We can go to the market for (to go) shopping. I have to buy (a) new dress and some ingredients of (for) my new recipe. We will went (go) to the salon for hair trimming. (to get our hair trimmed.) Its (been) a long time (since) we have not (last) went to Pizza Hut, so we will go their (there) as well. It would give me an immense pleasure to help you in (with) your office work. If you need any type (kind) of help in Business proposal writing, Research Paper (writing) or in preparing presentation(s), you can ask me any time."

I'm finished with my exams. I'm free now.

I'm waiting for January 1st: the start of the new year. This day will be important for me because my exams will be finished. I can hardly wait. I will send this message to my friend, " Hi, dear. My exams are over now and I'm free. We can go to the market for shopping. I have to buy a new dress and some ingredients for my new recipe. We can go to the salon to trim my hair. It's been a long time since we've gone to Pizza Hut, so we can go there as well. It would give me an immense pleasure to help you with your office work. If you need any help with writing a business proposal, a research paper or preparing a presentation, feel free to ask."

I made a few changes to help your entry sound more fluent. Please let me know if you have any questions. I hope that you enjoy your time out with your friend. Happy holidays!