This learning methodology was correct a few years ago. If you have studied Mathematics and English before, you will get 40 marks in the exam. So this is important. This means that you have completed 40% of the LDC syllabus if you have studied English and Mathematics. But this is not practical in the 2021 LDC exam. Because in 2021 the LDC syllabus was changed. If you study English and Maths you will get 20% marks in an exam. So pay equal attention to all subjects to study effectively.