Yes. Just keep at it – and do your workout every day. (As in "each and every day"!) Sometimes you'll feel like you're getting nowhere for a few days, but consistency will definitely pay off.
For PanMan I prefer using monitors to headphones – I feel that monitors make it easier to "visualize" where the sound is coming from.
For DB King I recommend keeping your volume at the exact same level from workout to workout. It will help you, as you, apart from the relative volume difference, also get a sense of the "absolute" level of sound. Again, consistency is key.
Lastly, for Peak Master, train using your DAW by inserting an EQ on different sources and boosting a relatively narrow band.
Hope that helps. Enjoy your training!
After achieving the Golden Ears, I felt like I had earned myself a little something and I signed up for SoundGym Pro... :)
The other games are also quite good, and there is a whole lot to learn from them too! ;)

true that

Hi Luhr, thank you very much for the hints. I will keep trying and learning.

you can reach it pretty easy if you workout every day... :D