Hi Fariha,
Neurology is a 3 year program, and you have to get more than 50% in your 10+2 for admission. The course fees in private institutes start from 50000 to 3,00,000.
Some of the neurology institutes in New delhi are

• Hamdard institute of medical sciences and Research
• Vardman Mahavir medical college(Public)
• Rajiv Gandhi paramedical institute
• Lady Hardinge medical college, delhi

for getting admissions on above colleges you have to get more than 50% marks.you can get further information at their official websites.
Hope you get it, Thank you