How to improve my skills relating to document controller cum accountant role? This field is pretty much new to me.

Hi - go step by step, first grasp the documentation, if it is done systematic way than work becomes easiar, as documents are proof and usefull confidential information of company, they should neatly be done, make a 'to do list' daily, finish  before you leave office, you can create your own excel sheet where keep record of complete and finish task....accountancy is also related to documents again, so handle one by one.....good luck.....

First you understand about all the work.
Then prepare a 'To do' list.
Keep puctuality, sincere dedication and go ahead with full confidence.
Have a good days..