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Focus on fields in which you can become good at.

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Focus on fields that you can become good at.

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The second sentence is grammatical and idiomatic as it is written. The first is not, because it has a double preposition. The first sentence becomes grammatical if you drop the final "at".

Focus on fields in which you can become good.

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    Well spotted! I missed the extraneous at in OP's first example. I doubt that was intended though - probably just what happens when you're doing cut&paste in a foreign language. StoneyB's excellent answer in the linked "duplicate" goes into the syntactic implications of preposition placement in these contexts though. Jan 13 at 18:48

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