The only certainties about the Big 12 are that Kansas will finish in first place and TCU will be last.For everyone else, the final week of the regular season represents a chance to either improve their postseason positioning or win over the NCAA tournament selection committee.Iowa State, Oklahoma, Texas and Kansas State were tied for second place at 10-6 after the weekend’s games with the Big 12 tournament set to begin on March 12. Baylor and Oklahoma State sit squarely on the at-large bubble, and even West Virginia has an outside shot at an NCAA tournament bid if it can get hot.With so much on the line, the last week of the Big 12 play could also be the most competitive one.“Every team has two games left. None of them are easy,” Iowa State coach Fred Hoiberg said.