Find the mistake in the Japanese

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Not quite. みずを のみます Mizu o nomimasu.

I drink water.

What you drink takes を (o), not が (ga): みずを のみます.

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Not quite. きのう えいがを みました Kinou eiga o mimashita.

I watched a movie yesterday.

Yesterday is in the past, so the verb needs ました (mashita): みました.

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Not quite. としょかんで べんきょうします Toshokan de benkyou shimasu.

I study at the library.

Studying is an action, so its place takes で (de), not に (ni).

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Not quite. わたしは がくせいです Watashi wa gakusei desu.

I’m a student.

わたし (watashi) is the topic here, so it takes は (wa).

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Not quite. あした がっこうに いきます Ashita gakkou ni ikimasu.

I’ll go to school tomorrow.

Tomorrow hasn’t happened yet, so use いきます (ikimasu), not the past.