| Feature | Salaam Chaus Superfast English | Rani Mam’s English | Blackbook of Vocabulary | | :--- | :--- | :--- | :--- | | | Bilingual (Hindi-English) | English/Hindi mix | English only | | Focus Area | Error Detection & Speed | Grammar Theory | Vocabulary | | Best For | Students with weak basics | Intermediate learners | Advanced learners | | Time to Complete | 15-20 days | 45-60 days | 30 days | | Unique Selling Point | Shortcuts for competitive speed | Detailed video integration | Root-word method |