Depends really. I lived in Germany for a few years. If you are in big cities or in the west, it is much easier getting around with English. Younger people tend to know more English compared to old people. In east Germany, a lot of people especially the older generation learned Russian as the second language.

That being said, even though they might understand and able to speak English, it doesn't mean they will! Their English is less fluent than their German, so they have less confidence in speaking it. Yes, we won't be able to speak Germans like the Germans do for sure, but we might be able to communicate in basic/broken German. When they can see how much we are struggling with it, they might switch to English after they realize their less-than-perfect English is much better than our broken German.

So if one plan to live and work in Germany for mid to long term, I think it is still best to learn some German.

Okay, I will prepare myself for attending Gothe Class, I have visited DAAD booth last Saturday.
They said for work with degree cert, German Level need at least B2.
Where apply for Master Courses with Scholarships need at least B1, 2years working experience and 3.0 CGPA.
Where I impossible to get scholarships there, what I can do is achieve B2 and complete my master here if possible (2 to 5 years) - Data Science Master.

So, it will be at least 2 years commitment for this. Headache.

My GF applied internship from UTM and doing good in Germany now, total 4 months only.
On 3rd months, she decided to apply for Master Courses at Germany after the final 6 months semester at UTM.
Then she will be able to get a job and lives there easily.

I was graduated from Asia Pacific University (TPM @ Bukit Jalil) with Bachelor of Science in IT with 2nd Class Honours, CGPA less than 3.0 (Graduated on Jan 2013), 4 years from now.
Working in at Accounting Software Company as Consultant, mainly on Supporting Client and Sales, not doing anything related to coding.

Want to ask is is anyone here can advice with experience.
If I want to get to work or study at Germany, to lives with my GF, what are the ways or choices I can make?

This is really important to me, I have less than a year time to prepare myself.
I will be going Europe for a trip on end of this year (14 days).

If I couldn't make it there, to worst case, we have discussed, may have to break up or wait until I make it there.
8 years relationship~