What does this phrasal verb mean: "get on with"?

[tomy tran]

Test No. incompl/elem-14 "Computers", question 1

How are you getting on ......... your new computer?

(a) at
(b) with
(c) by
(d) for

Test No. incompl/elem-14 "Computers", answer 1

How are you getting on with your new computer?

Correct answer: (b) with

Your answer was: incorrect
How are you getting on for your new computer?
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can you explain for me why not for but the truth answer is with, i still don't understand can you explain for me more please

[Alan]

This expression means manage How are you getting on with your computer? means: What sort of progress are you making with your computer?
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English as a Second Language
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