My subject interview - Questions from all areas of the subject, still I got stuck in Feynman diagram cause this is not there in CAIE. Differentiation technique - This also I was stuck but explain the technique which I know, especially in IGCSE you follow, mind-map, remedial, pneumonics and stress more on remembering and application, guided learning worksheet but in IB you have huge differentiation technique, with research skills as CAIE don't stress too much on this technique compare with IB.