What is the best app to learn for Java Certifications?

The best platform to prepare for Java Certifications is MyExamCloud.

https://www.youtube.com/watch?v=d8PYUcOZZxo

Oracle University has defined a Java certification path for the Java programming language.

The path consists of two certification paths:

Java SE Certification Path: Certification exams for Core Java ( SE 8, SE 11 or SE 17) Developers

Java EE and Web Services Certification Path : Java EE 7 Application Developer

(Not available) Java EE Architect Certification Path: Java EE Architect (Note that the certification has been removed from Oracle. Oracle University might have some plan to change the exam syllabus to cover DevOps and Cloud Deployment skills)

This article discusses more about Java Certifications in detail.

https://www.myexamcloud.com/onlineexam/javacertification.courses