Hi Suryavanshi,
You need to specify the type of field work you wish to undertake.
You need to observe in the HR Dept about the maintainance of employees files first as to whether it complete in all aspects like date of joining CV accompolished with copies of educational certificates, relieving letters of the previous employers the date of appraisal.
Secondly, you need to observe the methdology of recruitments and type of ratings adopted of each posiotions, various types of tests conducted for selection of candidates
Thirdly, the method adpoted by the organization for performance appraisals like the appraisal form adopted and the type of ratings done and percantage of increments suggested by the HR.
Fourthly, you need to observe the stuatory aspects like ESI, PF PT fiormalities of the organization.
Finally other things like notice period of employees leaving the organization, exit interview report submittted by the HR and various other aspects like issuing of memo, warining letters and show cause notices to the employees.
Hope this serves your purpose.
Regds