Polytechnic

Dear aspirant, Glad to meet you. Eligibility criteria for pursuing B.Sc. Is 10 + to or equivalent passed from recognised board. Some universities consider Polytechnic Diploma after 10th as equivalent to 10 + 2 board while some universities do not consider is it as equivalent. So, it is not just about B.Sc. It is about the university. In some universities you can get admission in B.Sc. After Polytechnic Diploma while some universities may not Grant you admission until you have passed the 10 + 2 exams from a recognised board. IGNOU B.Sc. Eligibility :
Students must qualify 10+2 level with a Science stream or equivalent qualification from a recognised education board. IGNOU B.Sc. Admission Process:
Selection to the B.Sc. Course is based on merit secured in the last qualifying examination.

Dear aspirant, Glad to meet you. Yes you can do B.Sc. After Polytechnic as the eligibility says that you must be either a passed student of standard 12th or must be having a Diploma from an AICTE approved college
So first complete your Diploma successfully with good marks and then you can apply for the colleges of your choice. Your choice of doing an MBA after B.Sc. Is a good choice. So move on. One more thing that I want to tell you is that MBA is a very good course and if you want to do that then you are on a right track. But one advice that I want to tell you is that instead of going for B.Sc. If you somehow manage to get into some Engineering college then your can triple up the benefit.