About what is the better option in this case Technically it's not wrong to use 'What about?', but it's not often used in this type of situation and sounds a bit odd What about is mostly used when asking for opinion or information What about that house? What about this color?

If you're asking about specific eligibility requirements to actually sit the test, then no, there are none. Anyone and any age person can take the test If you're asking whether you'll be able to pass then, all of the tests consist of a Kanji section, along with vocabulary, grammar and listening, so taking one below your level would not be a smart idea since you do pay for it after all N1 2000 Kanji N2 1000 Kanji N3 650 Kanji N4 300 Kanji N5 100 Kanji The following links give more relevant information http://www.jlpt.jp/e/guideline/testsections.html http://www.tanos.co.uk/jlpt/aboutjlpt/

Register means to create a new account, while login means to use ID and password of an already created account, that's why you first register and only then you can login

Well, the correct and simple way of expressing same things without sounding impolite could be: It's a pleasure to speak with you. I have stopped talking to him. She is speaking with him. edit: accently double posted in the comments