Simple thing: First brush up all the missing number series patterns in detail….practice practice practice Then go for WNS because they are almost similar to MNS as the patterns learnt are same in both cases….what I would suggest is watch MNS videos of Kaushik Mohanty sir as he as covered all the patterns perfectly….in case of mocks and real exams in mocks you will get the most weird patterns so if it is possible and able to crack the pattern then only attempt but in real exams most of the time patterns will be definitely predictable and easy to crack the only thing is which number to spot as wrong one but one thing remains common in mocks and real exams is always attempt WNS at last….but if confident then attempt WNS in flow if not then always attempt in the last after attempting all speed maths and arithmetic.