The 'P' in PCMB stands for Physics, 'C' stands for Chemistry, 'M' means Mathematics and 'B' stands for Biology. These are the list of courses that must be passed in order to proceed in studying any science related course in the tertiary institutions.
Courses like medicine, engineering, pharmacy can be studied if you have a knowledge of physics, chemistry, mathematics and biology. Physics, Chemistry, Mathematics and Biology are pure science subjects that form the basic knowledge of science in students. Due to the nature of these subjects, many students tend to run away from it.
Mathematics and physics mostly deal with calculations, while chemistry and biology though with little calculations, are practical oriented courses. As a result of this, it is advisable for the students to always read their books and ensure that they are good in calculations, so that they will find all these science subjects interesting.