The chrome desk top setting certainly shows me little lightbulbs to click on when i open a unit. Clicking on the lightbulb takes me to the notes for that unit. No lightbulbs on the app!
That link should take you to the notes page. Tap on 'table of contents' at the top and - hey presto! - a list of the grammar points appears so you can go straight to the point of grammar you want to check.
Adding this link to your homepage will mean you can access the notes easily from your mobile - and the table of contents means you can go back and find a bit of grammar you want to check, too.
I have ibisc to thank for this link- diolch ibisc!
It seems to me that a parent can go to the school to collect their child for instance or a delivery man to deliver something and in that case it should be quite possible to translated dw i wedi mynd i'r ysgol as I have gone to the school while for a pupil I have gone to school would be correct. Therefore both answers should be acceptable