Prep Tips ( this is what i did. YMMV

)
If i had to study the theory part, I would do that first. Somewhere there's a grid that breaks down OG problems topic wise. I'd use that to practice 40problems of (PS/DS/CR/SC), timing myself to finish within 70mins.
Track my mistakes following the tracker (you should probably find this also somewhere)
Use the weekends to take 1 test in the strictest of conditions (ok i skipped the AWA part but i did take the remainder of the exam locked in my room )
Track my mistakes.
Ask Qs repeatedly. I wasn't in the least bit embarrased to ask if i didnt get it. Hey, 10,000K is a lot of money!!
Repeat above process
Oh yeah: Find/form a support group. Be real handy when it comes to bouncing ideas off each other for essays.