See this page for information about Russell Targ’s ESP Trainer app for the iPhone.
As it says on Russell’s webpage,
In a year long NASA program with 145 subjects (under Contract 953653 NAS7-100) many were able to significantly improve their scores. Four of the subjects improved their scores at the hundred-to-one level or better. This approach has been used with surprising success on Wall Street. But of course, past results are no guarantee of future performance.
Because you are learning a new skill, slower is better than faster.
If you find yourself frequently scoring 12 or more, write to the developer: Contact Russell Targ