I want to Give Platform App Builder Exam . I have done trailmixes but when I attempt The Question Then I am facing difficulties.

Official Cert Trailmix:

https://trailhead.salesforce.com/users/strailhead/trailmixes/prepare-for-your-salesforce-platform-app-builder-credential

Additonal Prep:

https://trailhead.salesforce.com/content/learn/trails/platform-app-builder-certification-prep

Udemy Platform App Builder course by Mike Wheeler

- Free PAB mini-course by Emily Call, MBA on YouTube

- Recommended Trails from the PAB trailmix on Trailhead by Salesforce

- Focus on Force practice exams

From there you could look for Practice Exams and study materials through sites such as:

Saasguru.co; and

Focusonforce.com