Among the five subjects 5 subjects

1. Life sciences - the syllabus of the entrance is based on the major topics of life sciences.

2. earth, atmosphere, ocean & planetary science - syllabus covers the topics related to earth, environment, atmosphere etc.

3. physical science  - syllabus includes physics

4. mathematical sciences - syllabus includes mathematics

5. chemical sciences - syllabus includes chemistry.

So with environmental science the subject earth, atmosphere, ocean & planetary science will be.more related so if you want you can select this subject.

Hope you find it helpful.