No, you won't need to repeat the 私 and rewrite it because after you first mentioned you're the topic it's obvious that you're still talking about yourself. Btw, と actually doesn't work as "and" in the sense as it does in our European languages. You use と as a particle after someone you do something with or to connect nouns. I guess you just started learning Japanese, just the hint: For verbs there exist different forms and in your case for です it's で. So actually your correct sentence would be: 私はアンドレスで日本語の学生です。 (Also works: 私はアンドレスです。日本語の学生です。 but this repetition is a bit boring, isn't it? But you can still drop the 私は)

Hola, ya Niklas-san te contertó perfectamente. Y ahora quisiera contarte sobre "teclear". ん necesita teclear "nn" antes de "na ni nu ne no y nya nyu nyu" por eso teclea "minnna" para みんな. (みんあ no existe.) Una cosa más, みなさん es más formal que みんな así que sería mejor decir みなさん cuando escribes un cuaderno en la forma formal. Espero que te ayude. Un saludo.

"You" and "me" aren't needed too often. It's more polite to call someone by their name (in place of "you") and you only need to use "me/I" when you're emphasizing yourself, for the most part. Like "Me too!" then you would use it.