There are several resources and books available for mock test preparation in Commerce. Some of the recommended ones are:

1. "Mock Test Papers for CA Foundation" by CA Raj Kumar
2. "Mock Test Series for CS Foundation" by CS Nishant Bhatnagar
3. "Mock Test Papers for CMA Foundation" by CMA Ravi Sonkhiya
4. "Commerce Mock Test Series" by Prof. Jignesh Shah
5. "Mock Test Papers for B.Com" by Dr. Vivek Gupta
6. "Mock Test Papers for M.Com Entrance Exams" by Dr. Rakesh Jain
7. "Mock Test Papers for CPT (Common Proficiency Test)" by CA Rajesh Makkar
8. "Mock Test Series for IPCC (Integrated Professional Competence Course)" by CA Padhuka
9. "Mock Test Papers for CS Executive" by CS Rajneesh Arora
10. "Mock Test Papers for CMA Intermediate" by CMA Rajesh Singh

These resources provide mock test papers, sample questions, and practice sets to help students prepare for their commerce exams. It is advisable to check the syllabus and exam pattern of the specific exam you are preparing for and choose the relevant resource accordingly.