Maoist ultras in Bundu city of Jharkhand have adopted new strategies to strengthen their cadre base by confiscating the educational certificates of youths and compelling them to join their militant cadre.The determination to get back their academic certificates,confiscated by the ultras, has prompted the teenagers to join the militant outfits.The story came to light, when the 21-year old Mohit Munda,a resident of Gumta village and a Maoist wanted in three cases in Bundu police station, surrendered on Sunday (June 18) to police in the presence of other villagers.