smeagolknows

Hello there, i haven't played L2 in like 15 years but if i remember correctly there was no R-Grade. I'm at lvl 97 now doing a quest (gathering blood from vampires) and i still got the R-grade armor and weapon an npc gave me back at lvl 40 if i remember correctly. What is this R grade? How can i buy S-grade equipment and should i? What do i do after i finish this quest that tells me i should gather 500 blood vials and get to lvl 99 so i can recieve a prize.Is it the last quest i'll be getting? Sorry about my questions i just need some guidance lol.