If English is an additional subject and your brother has failed in it along with two main subjects , his eligibility for the compartment exam depends on the board's rules:

1. CBSE Board – A student can appear for a compartment exam if they fail in one or two main subjects but must have passed the additional subject. Failing in three subjects usually leads to a reappear or failure status instead of a compartment.

2. State Boards – Rules may vary, so checking with the respective board’s official guidelines is essential.

It’s best to consult the school or board's official website for confirmation.