Hi,

No Target Publication is not enough for preparation for JEE MAINS.

If you want to score good marks  -
1.Try to solve as much as MCQ from books. Try to understand the concept (it is much important in this exam)
2. Solve all problem of MATHS-I and MATHS-II from textbook.
3. Always solve question of every topic at the back of your textbook.

This will definitely helps in score better marks.

Also, according to me these are some best books for JEE preparation :-

Best Books for JEE Physics

• Concepts of Physics by H. C. Verma
• Understanding Physics by DC Pandey
• Practice Book Physics for JEE Main and Advanced by DC Pandey
• Wiley's Halliday / Resnick / Walker Physics for JEE (Main & Advanced) by Halliday, Resnick and Walker
• Problems in General Physics by I. E. Irodov

Best Books for JEE Math

• Cengage Maths by G TIWANI
• Comprehensive Mathematics for JEE Advanced by Tata McGraw Hill publications
• Problems Plus in IIT Mathematics by A Das Gupta
• Arihant Problem Book in Mathematics for IIT JEE by SK Goyal

Best Books for JEE Chemistry

• NCERT Textbook
• Problems in Physical Chemistry for JEE (Main & Advanced) by Narendra Awasthi
• Organic Chemistry by Morrison and Boyd for Organic Chemistry
• Concise Inorganic Chemistry by J. D. Lee for Inorganic Chemistry
• Modern Approach to Chemical Calculations by RC Mukherjee

Hope this helps.

Good luck.