Here you will find different wordlists categorized by level according to CEFR.
Here you will find extensive wordlists categorized by topic. Each topic includes subcategories that will help you expand your vocabulary knowledge.
Here you will find lists of English vocabulary based on how common they are used in the English language.
Categorized Wordlists
English Proficiency Tests
ESL Coursebooks Wordlists
Here is essential vocabulary for the Cambridge English exams: A2 Key (KET), B1 Preliminary (PET), B2 First (FCE), C1 Advanced (CAE), and C2 Proficiency (CPE).