When you enroll in a private pilot licence course (also known as private pilot license course in some regions) you'll soon realize that aviation involves a lot of communication with instructors air traffic control in manuals and in exams. English is widely accepted as the international language of aviation. So yes a good command of English helps a lot.
You don't have to be Shakespeare but you need to:
Understand technical instructions from your instructor
Read and interpret flying manuals checklists regulations
Communicate clearly with air traffic control especially if you fly across regions
Answer written and oral exams that are often in English or require English usage
Most training organizations expect you to have at least basic to intermediate English skills enough to read write listen and speak aviation vocabulary.
Ground school / theory classes: lessons notes textbooks are mostly in English
Exams and assessments: many will be in English or will expect answers in English
Flight training communication: when flying you ll speak in English (especially for radio communication)
Aviation regulations / documents: manuals notices laws are often written in English
Don't worry while a certain level of English is needed it's not a barrier you can t overcome:
Many flight schools offer English support or remedial classes
You can practice aviation English radio communication phrases technical terms
Consistent reading listening to aviation podcasts speaking English daily helps
Over time your English will improve side by side with flying skills
Yes English is essential in a private pilot licence course / private pilot license course because aviation is inherently an English speaking environment worldwide. But effective training programs know this and often help students boost their language skills. If your motivation is strong a moderate English level is enough to get started and improve with time.