See in general, Engineering students get a lot of scope in Marketing divisions. But right after the Diploma there are very less chances for you to get such a job opportunity. You can go for the BTech course and then you can get some chances in the non core fields or you can go for various diploma and other programs in Marketing. Now as you have a interest in Marketing, I would recommend you to go for BBA course which can give you a really good career ahead. For that you have to complete your 10+2 course with any subject and then you can go for it. Remember to have Mathematics as a subject in your 10+2. This can also be a good career option towards Marketing.

To know more about BBA visit the link below:

https://www.careers360.com/courses/bba-bachelor-of-business-administration

To know more about Marketing Management visit the link below:

https://www.careers360.com/courses/marketing-management-course

I hope this answer helps. All the very best for your future endeavors!