The teacher is good!

[eelt]

Could anyone whose first language is English please correct the followings? And please explain why. Thanks.

The teacher is good, although he mess up with some applications in the class. His teachings on fundamental method of solving the problems are very accurate.

[Anglika]

Could anyone whose first language is English please correct the followings? And please explain why. Thanks.

The teacher is good, although he mess up with [he messes up = makes errors/ he messes with = plays around with] some applications in the class. His teachings on fundamental method [a/the fundamental method = there is one method taught/ fundamental methods = more than one method is demonstrated] of solving the problems are very accurate.

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[eelt]

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Thank you very much.Anglika. Thanks for the help.