What are some good thrash metal or rock songs to learn?

Well, I am 14 years old and have been playing for about 5 years now. I am pretty good. I play a lot of metallica, i mean a lot of metallica and tons of other rock bands. I like Slayer, Nirvana, Megadeth, Ozzy Osbourne, and any othere rock band that isnt gay like Nickelback or Green Day. Well anyways i have an open mind so what songs should i learn? Thank you for your advise!