Registration And Purchase Of Immovable Property

'A' wants to sell his part of land because he thinks his land would be soon occupied by his younger brother 'B' who is too smart in the field. 'B' took many loans on their father's property without partition with 'A'. Mutual loans. Both agreed because 'A' is an emotional fool. Now, 'A' wants to sell his part of property at the lowest rate without the knowledge of 'B'. Due to financial pressure + fear of loosing everything. What must he do? Please suggest the best way that helps in recover A's property and supports his financial conditions as well.