You spell the word “student “ in Hiragana like this: せいと
Hiragana is basically the phonetic Japanese script and it is used to represent all of the sounds that are included in the Japanese language.
You should be able to write just about all words in Hiragana, but it is important to remember that the Japanese texts do not have spaces and so it can be difficult to determine where one word or sentence ends and another begins.
You can use resources like Guide to Japanese in order to learn how to write Hiragana, but remember that it is not as simple as it looks. The slightest variation in the letters could end up changing their meaning, so you will want to tackle every translation with care.
If you are having difficulties, this website should help you out.