BITSAT English section is divided into:

Grammar: Agreement, Time and Tense, Parallel construction, Relative pronouns, Determiners, Prepositions, Modals, Adjectives, Voice, Transformation, Question tags, Phrasal verbs

Vocabulary: Synonyms, Antonyms, Odd Word, One Word, Jumbled letters, Homophones, Spelling, Contextual meaning, Analogy

Reading Comprehension: Content/ideas, Vocabulary, Referents, Idioms/Phrases, Reconstruction

Composition: Rearrangement, Paragraph Unity, Linkers/Connectives

We cannot vouch for Youtube channels but we can help you with books that can help you in preparing for BITAT.

Word Power Made Easy (by Norman Lewis)

This is the go-to book to improve your vocabulary. It is not a book to be read but a book to work with daily to enrich your vocabulary.

High School Grammar and Composition( by Wren and Martin)

It is a very good book for people who want to improve their grammar skills. It helps to understand and conceptualise different aspects of grammar and it is a must have book for anyone with poor grasp on verbal ability or who wants to make up with the basics of english.