Help me choose the font, size and style of the info text in my app

[Mohamed_Belal]

I am creating an app for medical students to revise medical information but as you can see in my picture the font of the text is very bad and not inviting to read.

can you please suggest to me ways to make the text more legible

[Ammaraldewani]

try this font : Helvetica

[Groza (95)]