Chicago's WTTW and CPB will join PBS in leading pubTV's Ready to Learn grant projects. For the first year, they received a total of $23.2 million from the Department of Education, CPB said yesterday. The joint Literacy 360 project of CPB and PBS got $15.8 million for programming and outreach, aiming to measurably improve the reading of kids from low-income families. WTTW got $4 million to co-produce a children's series, Word World. Grant-seekers scrambled after the department announced that the funding would be split among grantees and not entrusted entirely to PBS.