Surveying

Sorry but can you guys help me on it?

I'm presently doing a short period survey on the following:

1. Which chapter is most difficult in chemistry Form 5?
2, Which chapter is most difficult in chemistry Form 4?
3. Which are the subtopics you feel hard to cope?

Please comment on it.
If possible, in detail as I need it for a project.
Your help is much appreciated.
Thank you.

Chapters in Chemistry SPM

Form 4

1. Introduction to Chemistry
2. The Structure of the Atom
3. Chemical Formulae and Equations
4. Periodic Table of Elements
5. Chemical Bonds
6. Electrochemistry
7. Acid and Bases
8. Salts
9. Manufactured Substances in Industry

Form 5

1. Rate of Reactions
2. Carbon Compounds
3. Oxidation and Reduction
4. Thermochemistry
5. Chemicals for Consumers