UPSC ESE Official notification can be found at the upsc.gov.in.
'Applicants should note that there will be a ceiling on the number of candidates allotted to each of the centres except Chennai, Delhi, Dispur, Kolkata and Nagpur. Allotment of Centres will be on the first apply first allot basis and once the capacity of a particular centre is attained, the same will be frozen.'
Applications must be sent online at the portal upsconline.nic.in.
UPSC IES Or ESE 2018 Exam: How to apply
Follow these steps to register for UPSC IES or ESE 2018 exam:

Step One: Go to the official website of UPSC, upsc.gov.in
Step Two: Click on 'apply online'
Step Three: Click on 'Online Application for Various Examinations of UPSC' from next page
Step Four: Read the instructions given there
Step Five: Click on the registration links
Step Six: Register for both parts
Step Seven: Enter the required details
Step Eight: Upload required documents
Step Nine: Pay the fee
Step Ten: Submit your application form
Candidates may directly go to the website 'upsconline.nic.in' and follow the steps given above from "Step Two".
Note: On successful completion of your complete application, an auto-generated email will be sent on your registered email-id. In case email is not received by you please check / ensure that submission of Part-II of the Application has been made by you.
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