What is the correct preposition to use with ambitious?
- I am ambitious to achieve success.
- I am ambitious about achieving success.
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About is possible, but so, too, is for.
As ambitious is an adjective, it rarely needs any preposition at all.
An ambitious man.
An ambitious concept.
An ambitious goal.
If you must have one, 'of' and 'for' are possible but also obsolete.
In your sentences, "I am ambitious" would cover it, or "my ambition is to succeed/achieve success"