Hello Dibyajit
Please see video on SA 315 and also see topic “Identifying and Assessing Risk” in Notes of SA 315, we have explained 4 points with tabular example and also hindi explanation. please see it and comment back specific doubts and concern, will help you with that.
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Thanks, sir, As per SA 315 I understood the same. SA 330 relevance on this specific answer, can you make me clear how to attach the same in this qsn ?

4 Points are explained with respect to SA 330

1. Reasons for Assessing RMM — RMM can arise because of many reasons , it can be because of excess cash receipts leading to risk of misappropriation / quality of raw material like coal is difficult to determine / godown staff is known for misappropriations / no supervisor for 9 months in a year on godown / complexity of computations / no appropriate internal control system….. etc so that we design appropriate procedures if problem is with quality we should get instrument or people who can judge quality  
2. Likelihood of Misstatement — Higher likelihood higher RMM more procedure
3. Relevant Controls — How good are relevant controls ? — cover these controls in test of controls
4. Higher RMM —  More Persuasive Evidence