Complex sentence: The FL Class are children who pass lots of tests (including the Raven's Test) so It's not that easy to study in SPED.Luckily, there are still teachers who teach the SL Class which is the class for children with disability.
Split into simpler sentences: The FL Class are children who pass many tests (including the Raven's Test) so it's not that easy to study in SPED. There are still teachers who teach the SL Class, which is the class for children with disability.