Do not decide from word position alone. Ask: Which noun does the adjective describe? Then check agreement with that noun.
كِتَابُ الطَّالِبِ الْجَدِيدُ = the student's new book. The nominative الْجَدِيدُ describes كِتَابُ.
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First Find the Described Noun
Do not decide from word position alone. Ask: Which noun does the adjective describe? Then check agreement with that noun.
كِتَابُ الطَّالِبِ الْجَدِيدُ = the student's new book. The nominative الْجَدِيدُ describes كِتَابُ.