OH! I want to help you but as you can see po
your child need to understand and learn biology try to research something na interest nya such like why water and oil cannot be  together .
but as if I were you po try to guide your kid so matutunan nyang gumawa ng kanya ng hindi kailangang umasa sa iba just guide him/ her it just my opinion 
but try to search simple projects
also need nyo po ng
5 scientific methods