Grammar Exercises – Level B1

Adverbs
Both, either, neither
Broader range of intensifiers; So, such, too, enough
Comparatives and superlatives
Question tags
Conditionals, 2nd and 3rd
Connecting words expressing
cause and effect, contrast etc.
Embedded questions
Future continuous
Modals – must/can’t deduction
Modals – might, may, will, probably
Modals – should have/might have/etc
Modals: must/have to

Past perfect
Prepositions of place
Present perfect continuous
Present perfect/past simple,

Present perfect / past simple (ex 1, ex 2, ex 3, ex 4)

Reported speech (range of tenses)
Simple passive

source: https://www.examenglish.com/grammar/b1_grammar.html