What does 'to get on' mean? Is it a phrasal verb?

[Guest]

Test No. incompl/inter-41 "Good Bye", question 5

Now, I must insist as your supervisor if you really want to ......... on in your career, you must tell me the truth.

(a) take
(b) break
(c) get
(d) hold

Test No. incompl/inter-41 "Good Bye", answer 5

Now, I must insist as your supervisor if you really want to get on in your career, you must tell me the truth.

Correct answer: (c) get

Your answer was: incorrect
Now, I must insist as your supervisor if you really want to hold on in your career, you must tell me the truth.
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what does that mean of "get on"?

[Alan]

This means make progress (in your career) and be successful.
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English as a Second Language
You can read my ESL story Start or begin?

[Hieupt]

Hi Alan,

Is there any difference between "get on" and "get ahead"?
Seems to me that their meaning are same, "make progress; be successful".

Thanks. Hieu.
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Thank you very much,
Hieu Phan.

P/s: Please just correct if I'm wrong somewhere!

[Mister Micawber]

Yes, in this sentence either would do, Hieu.
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Native English teacher at Mister Micawber's