'Computes any information for each XBlock that\'s necessary to execute
this transformer\'s transform method.
Arguments:
block_structure (BlockStructureCollectedData)'

@classmethod
def collect(cls, block_structure):

    block_structure.request_xblock_fields('is_proctored_enabled')
    block_structure.request_xblock_fields('is_practice_exam')
    block_structure.request_xblock_fields('is_timed_exam')
    block_structure.request_xblock_fields('entrance_exam_id')
