I would like to know what is the right approach to prepare for Salesforce Associate certification exam with two months for preparation.

Go for the articles and topic-based learning, also 2 months are enough for associates I think.

I prepared from practice exams of Salesforce Ben and cleared successfully:

https://www.salesforceben.com/free-salesforce-associate-practice-exams-available-now/

also, this article contains all the relevant information :https://dineshyadav.com/salesforce-certified-associate/

https://www.salesforceben.com/salesforce-associate-certification-guide-tips/