Anyone and any company can register this domain name extension. 

The minimum term for .shiksha  domain names is 1 year

The domain registration timeframe for  .shiksha during general availability is Instant.

Domain Names must:

• have minimum of 2 and a maximum of 63 characters;
• begin with a letter or a number and end with a letter or a number;
• use the English character set and may contain letters (i.e., a-z, A-Z),numbers (i.e. 0-9) and dashes (-) or a combination of these;
• neither begin with, nor  end with a dash;
• not contain a dash in the third and fourth positions (e.g. www.ab- -cd.shiksha); and
• not include a space (e.g. www.ab cd.shiksha).

You may visit them here: Afilias Limited.