I recommend new freelech torrents. Also torrents uploaded in the last 12 hours (the newer the torrent, the better). Then just leave your computer on and seeding. I usually get the majority of my torrents up to a 1.00 ratio within 48 hours (although I do also get about 20% that won't bother going above 0.5 for ratio).
Been doing it like this for the past month and I have really raised my ratio.
In addition, if you have utorrents, you can sort your files by last active and see what torrents were recently accessed/uploaded.