CBSE 12th

It depends on the college in which you wish to take admission.

Hi Yatin, 53% is a poor score and chances are less, unfortunately. Also, coming from NIOS admission chances anyway is very competitive. You can check countries in Europe but write to the universities first and then apply. NIOS may or may not be accepted depending on the university.

Hi Raghavan,
The scores are good, it will depend on your overall profile now and your non-academic profile. If Harvard sees you fit as per their admission process you may have a chance. You must not only have good academics but must be an all-rounder and contributor.

Hi Ishant,
Harvard is one of the top ranking universities in the world and highly selective. You will require excellent academic scores and an outstanding profile to be offered a seat. Check their website and learn about the admission process and kind of students they generally take in, you have to prepare accordingly.

Please refer to the link provided below for details regarding careers after class 12. Select a stream you feel comfortable with and then you can proceed further with your choices.
https://www.shiksha.com/careers

Yes. It's like your regular degree program.