Hello,

After obtaining the MBBS degree, one needs to specialize in medicine or surgery by doing MD or MS which will make them eligible to super-specialize in oncology by completing their M.Ch or DM (3 years). 

Candidates who wish to pursue their super-specialization in Oncology need to clear NEET-SS examination. According to National Board of Examinations (NBE), candidates who are in possession of recognized postgraduate medical degree (MD/MS/DNB)/Provisional Pass Certificate or an equivalent recognized qualification in accordance with eligibility qualifications for super speciality courses can apply for NEET-SS.

Certain institutes, like AIIMS New Delhi, JIPMER Puducherry, PGIMER Chandigarh, NIMHANS, Bengaluru and Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram conduct their own entrance examination to admit students.

Hope this helps.

Good Luck!