Hello,

You can  refer to the following books to prepare for SSC JE (Mechanical).

Khanna's Mechanical Objective Type - Dr. Sadhu Singh

Kiran's SSC Junior Engineer Mechanical Engineering Self Study guide - Kiran Publication

Mechanical Engineering for competitions - R.K.Jain

Objective Mechanical Engineering (Diploma) Competitive Exams - G.K.Publications

For more details, check here - https://competition.careers360.com/articles/best-books-for-ssc-je-2019

Thank you!!!

Dear Dhangopalan
As per my prior experience in mechanical field,  I can suggest these books.
R. S. Khurmi(objective and it also includes most important theoretical concepts)
Topic wise previous years solved papers by made easy
You can also prefer the books under G. K. Publications.
Apart from this try to practise more model papers and also mock tests too by keeping stopwatch .  So that you'll get to know how you need to practice and how much time you need to.
All the best.