Anxious" and "Eager"

"Anxious" should refer to anxiety and not pleasant feelings such as enthusiasm or excitement. It should be followed by a gerund (the "–ing" verb form), not an infinitive ("to" and the verb). Use "eager"(happy)  with the infinitive.

• "He was anxious about becoming the President." (He had an uncomfortable feeling about it.)
• "He was anxious to become the President."
• "He was eager/ready to become the President." (He was happy about it.)
• "He was waiting to become the President."