Harry Potter: Phoenix Q&A

how do i get the book that is on top of the shelf at the library. (this is just after i take someones homework and give it to someone else) please explain in detail.

Where is luna lovegood in the PSP version i cant find her anywhere =[

I have done 97% 97% and 94% but cant find out what else to do.

I still have takes for the Common Room and the Room of Requirement.

Please help.

Can anyone please help me with a precise step-by-step guide to dismantling the clock and what cogs to move and put where? Pleeeze as it is driving me mad!