Whether one uses texts, groundschool, examination technique aids, etc., to arrive at a fit state for the Meteorological Examination, the principal point, in my opinion, is to compare and contrast what one is learning about this specific subject with a broader view of the issues.
In other words, as has been intimated earlier in the thread, ally the specific meteorological learning with an elementary view of the principles involved; for example, O-level physics.
That way, one's mental assimilation of the topics involved in the Meteorological Examination syllabus will be related to general principles with which one is familiar.