when you go t curascant, you need to protect the library, that level i just can't complete.
can you guys give some tips?
Use the Clone Commander and guard a specific bookcase, that's pretty much it on the library part.
In general the Jedis will ignore you allowing you to take free blasts at them. Occasionally there will be one jedi that goes after you but that is rare. Ignore the temple guards until you cleared the first wave of Jedis and focusing on protecting one bookcase is easier than protecting all of them. If your fighting a Jedi that is using force block shoot their feet.
Personally I would us an Engineer or Vanguard. If your playing as a Vanguard and FF is on, be careful not to destroy your own bookcases. If FF is off, you can drop a mine on pairs of Jedis and use the rocket launcher to take out single ones.
Its much easier if you use an Engineer though. Detpacks have similar power as to mines and the shotgun will take out most Jedis with 1 - 3 blasts. You can also use the fusion cutter to repair bookcases.
Often times the hardest part of that objective is clearing the Jedis that are there in the first place. Once you can get past that first half, defending is easy.
Once the level of Jedi has dropped below "Infestation" get an engineer and just sit there repairing bookcases. Problem is, of a Jedi goes after one, he can blow it up a lot faster than you can fix. So it's only good against stray fire. Kill any Jedi who goes after YOUR bookcase. Imagine it's your birthday present.
What I did, was become a commander and stand behind the jedi, they're much easier to kill if you shoot them in the back...
That's why Heavy Trooper's are good at that point (expecially helps to clear them out at the beginning.)