i think it's important to use what you have learned and keep practising. buy a chinese dictionary. read the meanings of the characters. learn some typical words in which a character is used. then try to create some sentences using these words. so firstly 字, then 组词, then 造句. that's how we learned chinese in primary school. i think nouns are the easiest to deal with. they often appear as two or more characters. very rarely do you see people using a single character as a noun. verbs and adjectives might need more concentration, since they are the key components of a sentence and their usages are more complex.

you can remember them in one day.and spend six months reviewing them