Science

The admission procedure varies from university to university, however, the general admission criteria is as below:
Admission to M.Sc program is both entrance examination based and merit-based. Certain universities like Delhi University offer both direct admission and entrance based admission to the program.
Universities like Delhi University and Savitribai Phule Pune University conduct entrance examination for admission to M.Sc. The Entrance exam is generally of 2-3 hours duration.
There are many universities in India which offer merit-based direct admission in M.Sc. Some of these universities are Banastahli University and Ramnarain Ruia College. The merit is decided on the basis of marks scored in B.Sc (Hons).
In University of Delhi, which also conducts entrance exams for admission to the program, 50% seats are also reserved for direct admission. Direct admission is offered to candidates who have passed B.Sc with 60% marks from affiliated colleges of Delhi University.

There might be very few chances of that, but yes, you could do economics honours even if you didn't have maths in class 12th. But it won't help you because down the line, for a career in economics, you will need to have a strong mathematics base which of course you missed in the two years of your high school.
If you want only a Bachelor's degree in economics, you can take it up, you'll have to work very hard in statistics and other important topics in mathematics and if you are planning on taking up admission on DU, yes maths is compulsory for BA (Hons) Economics from DU. Apart from it, you can try in other universities also but it depends on the eligibility criteria.