Which one of the following is not a correct ascending order of commissioned ranks in the defence forces of India?

Which one of the following is not a correct ascending order of commissioned ranks in the defence forces of India? Correct Answer Flying Officer, Flight Lieutenant,Squadron Leader, Group Captain,Wing Commander, Air Commodore,Air Vice Marshal, Air Marshal, Air Chief Marshal

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Question : What is Sachin's rank from the top in a class of 25 students ?

Statements :
I. Sachin ranks three ranks above Amit who ranks 18th from the bottom.
II. Sachin's rank from the top is two ranks below Deepti who ranks 23rd from the bottom.