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A group of students who come from Japan are going to visit London tomorow.

A group of students who come from Japan is going to visit London tomorow.

A group of students who comes from Japan are going to visit London tomorow.

A group of students who comes from Japan is going to visit London tomorow.

May I ask which of those are better ones concerning the verbs they used?

My biggest doubt is about the antecedent. I'm not sure whether "A group of students" or only "students" is the antecedent of the relative clause in the examples.

Could you please help me solve my doubt? Thank you!Emotion: smile
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The first two sentences are correct. You can use either. The "rule of proximity" allows for your second sentence.

The last two are incorrect. By using the form "comes" you're referring to the group, and you shouldn't replace the noun "group" with the pronoun "who", not even if that's a group of people.
"A group of students that comes from Japan is..." would be OK.
I personally seldom, if ever, use that option, though.
My personal choice would be "A group (of students who come from Japan) is going to visit London tomorow." Of course, it doesn''t have to be YOUR choice too.

Miriam
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My take

A group of students who comes from Japan are going to visit London tomorow.>>is correct

it should be 'A group of students as group mean it is more than one
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 miriam's reply was promoted to an answer.
Thank you very much for your replies! I understand now!!
A group of students coming from japan will visit London tomorrow.
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You focus on the main subject of the sentence which is "group" students aside, as you could still construct this sentence by omitted "of students". Therefore it is "comes" and "is", though I should note that since this sentence concerns itself with a nonhuman subject (i.e. "group"), it should also be "which" instead of "who" in the sentence.

Confusion about this happens a lot; where there is a misunderstanding between the corrolation of nouns and verbs (I think mistakes made about this are called congruence mistakes).

Anyway I hope this helps. Just remember, in cases like these, it's about "a" (singluar) group and not "the" (multiple) students.