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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