Hello Aspirant
The eligibility criteria for taking admission in BA English course is that the candidate must have passed their 12th Board exams from a UGC-RECOGNISED school and Board of Examination. The aggregate demand depends on the institution but it's usually 55%-60%.
There is no requirement of subjects, you can opt for BA English even if you are from the Science stream. They just need you to have English as one of the subjects in your 12th, and even if you didn't, it's not a problem. The stream of Arts and Humanities is open for students from all fields of study. Don't worry, you are eligible to apply for CUET UG English.

All the best!