In Reply To :
Agreement of sale cum gpa
There can not be composite document in the name of "Agreemement of Sale cum GPA" as stated and posted by you.
If it is there show it to a local prudent lawyer for better appreciation of document/facts, guidance and proceeding.
However, if you are located in Delhi and feel so, may contact me with records (on appointment) at:
Chamber No 647, Lawyer's Chamber Block, Dwarka Courts Complex, Sector 10, Dwarka, New Delhi-110075 Cell # 9891152939 or visit: vakil-saab.com