Does IPO gets allocated to people who apply first?

IPO allotment doesn't happen on the basis of who applied first or the first come, first serve basis. It depends on the response to the IPO from investors. If the IPO has not received good response from the investors and it is under subscribed then you may get allotted as many lots you have applied for. In other case, if the IPO is oversubscribed owing to high demand from investors, then allocation of shares to retail investors depends on the total number of shares available in the retail quota divided by the minimum lot size. So, if 10 lakh shares are available for retail investors and 2000 shares is a lot size then 500 applicants will get the shares. If the applicants are more than 500 then a lottery is used to select the applicants for allotment.