The My Lessons tab lists your upcoming and past lessons with times and pickup points.
As you progress, your instructor marks off skills across the syllabus (control, junctions, manoeuvres and more). You'll be notified when your progress is updated, so you can see exactly what you've mastered and what's next.
Your instructor tells you when you're test-ready — don't book your DVSA practical test until they give the go-ahead.