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To become a radiology after class 12 you need to do Someone who wants to pursue a B.Sc in Radiography should have completed Science (10+2) preferably with Physics, Chemistry and Biology/ Maths. The duration of the course is three years. You can also take up one-year certificate courses after 10+2 Science.

Hi ,as per your query I would like to tell you that in order to get admission in MD in radiology you must have pursued MBBS with and then appear in NEET PG exam . However if you want to go for radiology branch after 12 then you can apply for bsc in radiology for which you must have studied Physics, Biology and Chemistry till class 12 and Admission to B.Sc. programmes is done on the basis of marks secured by candidates in class 12. Minimum qualifying percentage is 50%.
You must have also appear in state level or University level entrance exam as admission is based on marks obtained in entrance exam .
Hope this helps