Means repeat this year from cbse

see, he need to self introspect and see whether he is capable of doing b.tech or not.remember, b.tech is not an easy degree to earn. its highly professional.if he wants to become an engineer only, ask him do cbse again and sit in btech entrances next year and prepare really well for them.if he does not want work that hard and not drop a year, do an polytechnic course.clearly, it all depends on him and only if he is ready to study hard.