You can go to a public library. If you have a library at your school, that would be even better.
Tisha B'Av in 2008 will be on August 10th.
Tisha B'Av begins at sunset and ends at nightfall the next day.
You should avoid all types of work until after mid-day. Also you may not prepare for the end fast meal until after mid day. If you must work for parnasa then consult a rabbi.