Verb conjugation of "säen" in German

Now I just got scared! Have I missed my own son's birthday? Luckily it is on the 19.08, exactly in a month. Man, you confused me now. Anyway, we had a great time in the mountains and the snow was great.
Please explain me the exact differences between British and American .... This year I'm trying to make the TOEFL. We can then discuss how we can prepare for this exam. I failed the first time.
I have learned German for one year and I would like to intensify my studies. Do not know how yet... It is very difficult at my age to start new projects in life. I am over 75, did I tell ya...