Hi,
     See there is no certain marking scheme in cbse. See when you give any entrance exam then youll get cutoff and all the exams that have cutoff for marks is 75% . All the best!

Hello,

As per the eligibility criteria, the candidates must qualify for the entrance exam and score a minimum of 50% marks in aggregate in standard 12 for admission in B.Tech, however the requirement may vary from institute to institute.