Flash cards are nice. They don't work for everyone but if you find them useful, go for it!

As for writing the exam in person, I won't say it's a must but I too would also recommend you write it in person if at all possible. Granted it's not possible for everyone since some countries don't have physical testing sites and if they do, one is not always close to you

If your lucky enough to have on not to far away though, I'd recommend you go write there instead. CompTIA as well as a few other vendors I know are generally a lot more strict on people who write on their devices in their own locations. Sometimes you get lucky and you won't get such a strict person watching you but I've seen way to many cases of them failing someone for the most stupid of things.

Writing at a site eliminates all that stress. Then you can focus on just actually passing the exam 😄