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How easy a subject is reflects the student's aptitude, not any inherent property of the subject matter itself and varies greatly from on person to another. I found English so easy as to require almost no effort but struggled wiyh mathematics and was extremely frustrated by it as I was very interested in science.A friend of mine was a mathematical whiz but just could NOT understand English grammar. Your question, therefore is meaningless because difficulty has almost nothing to do with the subject and almost everything to do with the student.
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