Teacher

NET is valid for lifetime lectureship. NET JRF is valid for two years.

Most community colleges require teachers to have a Master's degree or at least graduate study in the subject to be taught. Certification as a community college teacher is not required by state law, but it is helpful for those who do not have teaching experience.

To pursue for lectureship you have to give UGC NET exam for lectureship and then you can join as an lecturer after completion of training. If you clear the exam then they will consider you for training and then you will reputed in govt universities as an assistant lecturer. You can also try in private colleges as they can consider your profile for lecturer in basis of M.Sc.

You are advised to register for regular Ph.D / FPM or Ph.D by distance learning for a career as teaching faculty in B-Schools.

You need to have a strong command on your maths and do regular practice because practice makes the man perfect.

No, its not all necessary on rely on coaching for 11th and 12th, you can prepare at home. You just need to dedicate yourself for regular studies. Daily revising the concepts and giving importance to difficult concepts as per you. Perform well for periodic school exams. You can score good with self study alone.