I have read that "will" should not be used with "if" clause in conditional sentences. However, I feel that below sentence is grammatically correct even though "will" is used with "if" clause. Could you please help clarify same along with good explanation.
If you will not do it then I will do it myself
Please note that I want to know from international competitive exams perspective, so I need grammatically correct answer. Also, all good/additional information you may provide with the answer would be highly and sincerely appreciated.