English language or verbal ability or English grammar is very important subject in any competitive exam. Here are some topics of English grammar which can be very useful in your exams.

Article

Noun

Verb

Adverb

Adjective

Subject Verb Agreement

Pronoun

Conjunction

Tenses

Common Errors / Error Finding

Common Errors or Error Finding problems are asked in almost every competitive exams.
Here are some rules by which you can find errors in sentences.

Active and Passive Voice

Direct - Indirect / Reported Speech

Comprehension

Cloze Test

Sentence Improvement

Jumbled Up Sentences

Fill In The Blanks

Idioms and Phrases