Learn Spanish (Latin America): Siempre me equivoco porque no quiero revisar nada. - I always make mistakes because I do not want to review anything.

The verb for 'to make a mistake' or 'to be wrong' is equivocarse. It is a reflexive verb in Spanish, which means it requires a reflexive pronoun to show who is making the mistake. Since the subject is 'I', we use the pronoun me to say me equivoco.

Why does the sentence use nada (nothing) when the English translation says 'anything'?

Spanish frequently uses double negatives! Because the verb is already made negative by no in no quiero, the word that comes after it must also be negative. In Spanish, you literally say 'I do not want to review nothing'.

Is revisar the same as 'to revise' for a school test?

Not quite, it is a bit of a false friend. Revisar means 'to review', 'to check', or 'to go over' (like checking your work for mistakes in this sentence). If you want to talk about revising or studying for an exam, you will usually hear repasar or estudiar.

Why is porque written as one word here?

Written as one word without an accent mark, porque means 'because', which connects the two halves of this sentence. When asking a question ('why?'), it is written as two words with an accent over the e: ¿por qué?.