Decent, not thoroughly tested but only one of JTS kind really available right now, recommended for IGCSE Good app for IGCSE. Didn't get 5 stars because there has been a clear lack of care in this product. On a question it simply got the answer wrong (loudspeaker is driven by AC) and it also asked me to state what was being shown in the picture when no picture was present. Very sloppy, when you got through the results I noticed that you are again faced with a Similar problem, the picture is not readily available when going through wrong answers. However, there are not many others available.
Amazing Great app for revision! Need one for chemistry!