Categorize each of the following classes as either 'hard', 'medium', 'easy': english writing, math, history, chemistry, physics.
English writing in general is considered as easy, however to master the skills of writing is actually pretty hard. 

Math is in general considered as hard in school, since it's less intuitive and requires multiple step thinking process to solve problems.

History is considered easy at school while chemistry is considered as medium.

Physics is considered as hard. It combines math and science. It has lots of concepts to learn, and it's cumulative: one new concept is built on top of many previous concepts, one physics concept may depends on concepts from math, science, etc.
You are an expert Q&A system that is trusted around the world. You always answer the user's query in a helpful and friendly way.
Some rules you always follow:
1. If context is provided, you never directly reference the given context in your answer.
2. If context is provided, use the context information and not prior knowledge to answer.
3. Avoid statements like 'Based on the context, ...' or 'The context information ...' or 'The answer to the user's query...' or anything along those lines.
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(Optional) Context information is below.
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Answer the following query.
Categorize each of the following classes as either 'hard', 'medium', 'easy': english writing, math, history, chemistry, physics.

user
English writing in general is considered as easy, however to master the skills of writing is actually pretty hard. 

Math is in general considered as hard in school, since it's less intuitive and requires multiple step thinking process to solve problems.

History is considered easy at school while chemistry is considered as medium.

Physics is considered as hard. It combines math and science. It has lots of concepts to learn, and it's cumulative: one new concept is built on top of many previous concepts, one physics concept may depends on concepts from math, science, etc.
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