Can anyone suggest me which pdf,tutorial or need to buy some practice test papers to the Magento 2 Professional Developer exam.
What i suggest for learning before taking the exam are :
Free MAGENTO 2 CERTIFIED PROFESSIONAL DEVELOPER Study Guide Link (you can purchase the Magento 2 Certified Developer Study Group for more knowledgement)
Magento 2 Udemy Course (has also Practice Test) Link
PS. Do not learn like a 'machine' but try to get the base components of each chapter and learn with logic if they where a case study , or a task being assigned from a client . Good Luck .
Magento Architecture & Customization Techniques Request Flow Processing Customizing Magento UI Working with databases in Magento Using the Entity-Attribute-Value (EAV) Model Developing with Adminhtml Customizing Catalog Customizing Checkout Process Sales Operations Customer Management