Practise, practise and more practise. Know your way around SQL Server Enterprise manager, general relational database theory/normalisation (not essential but very useful), how SQL Server interacts with Windows security, how to apply security within SQL Server (rights, server and database roles), how to back up, restore and recover from a backup with multiple transaction logs, how to configure and troubleshoot replication etc.
If the books you have got cover the official Microsoft curriculum, then its simply a matter of getting to know its content better. Search for SQL Admin or 70-228 within this forum to look for other people's ideas/opinions.
Personally, I took it last december and don't think I'd pass it again if I took it tomorrow because there's a lot in there that I haven't used.
John