What do I need to get into Johns Hopkins University?

GPA UW & W?
SAT and ACT scores?
Extracurricular activities?

https://www.thoughtco.com/johns-hopkins-gpa-sat-act-data-786518

Look in this forum at the admitted students from last year and see what they did:
http://talk.collegeconfidential.com/johns-hopkins-university/

Many ways to get this information for this (and other colleges you are considering) – google the common data set for Johns Hopkins, look on Naviance if your HS has it, google Johns Hopkins class profile, look on the college website, look at college guide books (ex. Fiske, Princeton Review) etc.

You really, really want to get into John Hopkins. Compare your stats to recent admits and figure out where you fit. If you do have comparable scores, you may be admitted. On the other hand, you like lots of kids may not get admitted to their fist choices. i hope you are admitted and the higher you are in the comparison group, the more likely you will be admitted. Don’t dwell on what if I am not admitted. That doesn’t help your chance of admission, but could make you unhappy for quite a while… I hope you are admitted if that makes you happy, but you don’t need to get in to live a cull, happy life.