Does Apple macbook air 13 has the following Software, Microsoft Word, Excel, Paint, Power Point etc

Apple has its own equivalents to those applications in Pages, Numbers, Keynote, etc. If you want the Microsoft versions you will need to purchase those separately.

Office 365 subscription and purchase --> https://products.office.com/buy/compare-microsoft-office-products-for-mac

Those Softwares belong to Windows and do not come pre-installed on Apple Computers.