Hello,

There is no course to learn General knowledge. You can get books for GE and read it. There are many videos for old current affairs and they provide daily update. You can get them from YouTube. Follow news daily. Note down important notes while watching.

Read books for GE which provides history of country and other information. There are daily and weekly magazines available. You can buy them and refer them too.

This is a self study process and no course is available for it. So you have to learn in your pace and remember it. Most of it is facts. There is no other way to just remember it.

Hope it helps!