they have a general course..
but as part of their course here.. they have a whole book on permutations and combinations and probability. real good.
has good course materials.
sc,rc,cr is tough
math is tough too.
but their tutors are not good.
they have an ok phone and email support. each time you email them, it takes2-3 tries before you get an answer...
i am planning to sell mine in 1 month