Hello Aspirant

Yes, you should be able to pursue English Honors.

As you have mentioned that despite you getting a "Repeat Theory" in your Math paper, it is still written that you are pass in your Mark sheet.

The eligibility criteria for getting admission in a BA English program is that the student must have passed their 12th Boards with an aggregate of 50%-55%, from a UGC-recognized Board of Examination. Since the stream of the student in their 12th class does not matter in BA English, your Math RT should not be a problem. But make sure that your Mark sheet actually mentions that you have passed.