Dear Prathmesh,
It is always preferred to ICAI's Study Modules. Please be thorough with the study material that has been provided to by the ICAI.
Some tips to crack your foundation exmas:
1. Complete all your classes in time, so that you get enough time for self study.
2. Revise multiple times.
3. Practice mock test papers and past year papers.
4. Make a proper time table and try to follow it everyday.
All the best for your exams!
CAclubindia
