Which is the most correct?

Which is the most correct?
Your written sentences are not quite correct because their first part 'Familiar with C++ and JAVA' is not a noun. It has to be in the form of a noun so that it 'is proved by my final year projects.'
My suggestion :
(1)
My familiarity with C++ and JAVA as proved in my final year projects.
This sentence keeps your original ideas and express them in an appropriate way.
If you are not just familiar with C++ and JAVA, but are proficient, skillful etc in them, use the nouns proficiency, skills accordingly.
(2)
You can also write like this without using the noun form of familiar :
I am familiar with C++ and JAVA as proved in my final year projects.

hi, leepks

in my question, therer are 5 forms of sentences

which "form" is the most correct?

I presume you were writing a resume, for yourself or someone else...

So...
Proficient in C++ and JAVA.
or...
Recent projects done in C++ and JAVA.
or...
Completed several projects last year in C++ and JAVA.

Good Luck!

pks