I am a master (international)student in Germany, I will apply Phd in Canada or US. There will be a gap year between my graduation year and entrance year.
Now my plan to get reference letter is as follows: One letter from my thesis supervisor. Another two letters from the professor whom I took a class with and got an A.
Now I am not sure if any of the professor will remember me after (at least) one year. Surely I got best grade in their exam(oral), but this does not guarantee the chance.
The question is, should I made a impression to them, like directly(politely) ask them if I can get a reference letter from them in the future?Or just wait till the application time and sending emails to ask them? Or any other?