Working in a group on class assignments:

I prefer working in a group.

First of all, each individual in the group can contribute to classes assignments. They can all think of different ways to fulfill assignments.

As human beings, we all are limited, but more ideas or solutions can be provided by group work.

On the other hand, each team member only need to be responsible for one part of an assignment, therefore, it'll be much easier for everyone.

Moreover, we can become friends with each other after having got to known them better through working together in a group.

Finally, teamspirit is a critical quality we should have in a modern society. Working in a group can allow us to learn and possess such spirit(qualities).

That sounds like a great idea, I'm sure many tutors will game. Just send them a message and ask if it's okay when you schedule a session. :)

For speaking, the best way to improve is speaking to have regular conversations in English. I'd suggest a minimum of 1 hour a week (this can be broken up into two 30 minutes conversations).

Taking session with a tutor might be a good idea as you'll get feedback on your pronounciation and vocabulary.

Additionaly, to improve your listening you could try watching videos online (tedtalks are great as you can read the transcript) or movies and  TV series with subtitles. When you become more confident in your listening you can stop using the transcript or subtitles.

Good Luck :)

How to start learning English:
I want to improve my English but I don't know how to start. I can understand what other people are talking about but I just can't answer. Because I do not have much vocabulary. I even I learn by heart the words but I don't know how to use them ! And I think my grammar is really bad.
I am considering joining a class to improve TOEIC scores. But I think it's no use. Even I got the high scores, I still can't talk or write. The score is only a reference for a company. And the language school is really expensive.
I always use google translate. It's funny if I use google translate to reply the mail to my client !!!!
I think many people have same problem.

This was nicely, written there were just a few mistakes with word forms.
Why don't you try taking some online sessions?
I would suggest you ask a tutor to do sessions with set topics, that way you can prepare some vocabulary and practice using it. Your tutor will probably let you know if you are using a word incorrectly or are making grammar mistakes.
Ask your tutor to speak slowly, after some sessions you'll start to understand a little better.

Another tip for listening skills is watching movies in English. I suggest watching a movie that you've watched before in your native language, that way you'll be able to follow the story while focusing mostly on listening and vocabulary. :)