Hello sir/ma'am I am currently pursuing Chartered accountancy course in India and i have dream of studying in Wharton business school.so what are the things for which i should start preparing now?

Wharton is the most respectable and the leading college for business studies in the world. Here are the basic requirements that’ll be useful for your process for how to get into Wharton:

To begin with the core requirements, you need a strong GMAT/GRE score and a satisfactory GPA to get into Wharton. The average GRE score is 163 (Verbal) and 162 (quantitative section). The GPA for class 2020 was a 3.6. The average GMAT score required is 730.
TOEFL or PTE Academic test is required for all non-native English speakers
Academic Transcripts
A prior experience in a company (4 years average)
Apart from the above mentioned requirements, Wharton leaves no stone unturned in its search for the best applicants who possess qualities of leadership, management, marketing and other soft skills. 

The Following steps are given to help you with your process of how to get into Wharton:

Application Checklist – Background Information (Contact Information, DOB, Academic Degrees, Professional Experience, Family Information, Prior conviction Information) 
Application Fee for the MBA program is $275
Essay
– What do you hope to gain professionally from the Wharton MBA? (500 words)
– Taking into consideration your background – personal, professional, and/or academic – how do you plan to make specific, meaningful contributions to the Wharton community? (400 words)
– Optional essay: Describe yourself/certain events in your life in detail with information not mentioned anywhere else on your resume.
Academic Transcripts: Transcripts of all academic degrees received at the bachelorette/undergraduate level and beyond.
Letter of Recommendation: This section is divided into two parts
– Please provide examples that illustrate why you believe this candidate will find success in the Wharton MBA classroom. (Word count: 300)
– Please provide examples that illustrate why you believe this candidate will find success throughout their career. (Word count: 300)
Two Letters of Recommendations are required and the recommenders should be current/former supervisors and well acquainted with the applicant’s performance in a work setting.
GMAT and GRE scores should be not older than 5 years.
TOEFL or PTE Academic test is required for all non-native English speakers. The test dates shouldn’t be older than 2 years. (Applicants who have had their primary language of instruction as English during high school are considered as proficient in English)
Resume: Highlight Functional Job skills, Experience, Leadership and Management skills.
Scan the important parts of the documents clearly and it shouldn’t exceed 10 MB.
Interview: Once selected, you will be invited to participate in the  Wharton MBA Team Based Discussion (TBD). This essential discussion helps the applicant to express themselves freely. Make sure you’re candid and be confidently original with your conversation. Open your horizons on your passion and freely let them out. It usually goes on for 35 minutes where you can interact with 4-5 (randomly assigned) MBA applicants in a team. You will be given a situation and a purpose for you to collectively solve. Prepare on your personal skills and strengths and stay calm. 

All the best!