Will and Shall

What is more grammatically true?

I/We shall or I/We will

Are there any difference?

Best Regards

Hi Alex,

You can use shall with I and we instead of will:

I/we shall (will) attend an English class next year.

Also, you can use shall in questions like these:

Shall we go to the cinema tonight?
Shall I call you tomorrow?

TOEIC listening, question-response: Would you rather have juice or a soft drink?[YSaerTTEW443543]