Study Oxford and Keith. There is nothing JUNK in such books. Please quit this such a way of approaching towards an exam
. Knowledge always helps. However go through the syllabus for Dgca Cpl and read all the topics/Questions from Oxford and Keith.
http://dgca.nic.in/cars/D7B-B4.pdf
Study IC Joshi for Met. Try to do the questions from Oxford as well for met.
Professionals don't go for shortcuts.