Placement Papers - IBM

Hi Friends i had 3 rnds in IBM,.and finally got thru. 1st was a written test. this section has some aptitude from RS Aggarwal. there r arnd 25 such questions. 1 was analytical. 15 tech questions. total duration 1 hr. tech will be on C, OS and little bit of UNIX. 

2 rnds of interview. first was purely technical. second was puzzle cum HR rnd. they asked to divide a triangle into 5 triangles of equal areas and to reverse a linked list. then they asked me how do u rate urself in communication skills out of 5. we must rate and support it with instance in our life also. also they asked me to rate myself in drive to achieve, excellence, flexibility, problem solving/creativity.