Educational Phone Accessories Book Overhaul

My manuscript on phone accessories is finished, but it still needs to be elevated to true classroom-ready quality. I need a sharp eye to run a full grammar and spelling sweep while also double-checking the technical facts, compatibility notes, and safety guidelines I quote throughout the chapters... (Budget: £20 - £250 GBP, Jobs: Book Cover Design, Ghostwriting, Graphic Design, Illustration, Infographics, Research Writing)