Property price

That excess 25 lakhs will be treated as gift for you since it in excess of Rs 50K. So you need to disclose under IFOS then it will not be problem for you & at the time of sale of property you can claim the property cost as 1.25 crores.

( 1) What is IFOS ? 

(2) I have purchased a property on Feb 2015. Hence allready filed a return for AY 15-16 on 29 march 2016.

(3) All legal adviser told me that I have pay tax on Rs. 25 lac because govt will treat as a gift. 

IFOS - Income from other source.

You can ask ITO to refer it to valuation officer. If valuation officer value is less then stamp duty value then lesser value will be considered for capital gain purpose.

Yes, you need to pay tax on excess 25 lakhs with interest

You can file revised return & you will not find any trouble from IT Dept.

I guess you are wrong. Valuer system by IT department is no more in West Bengal probably. Really searching for solution. 

Refer proviso to section 56(2)(vii)(c)