You may be confident in using English in everyday situations, but the kind of English you need for study is rather different. It is what is known as 'academic English' and is the type of English you need for

•reading and understanding your study materials
•writing about your subject or area of research.

Academic English is different from everyday spoken English. It may be used to:

•describe an object or situation
•describe a process or how something works
•explain something.

•Publications in peer-reviewed journals
(to read and to write)
•Organizing and participating in international conferences (give presentations)
•International co-operation projects
•Syllabus and course development for international audience