Dear Aditya,
In case services provided to SEZ are exempt by Adhoc means you have complied with all the conditions of exemption notification then the service provided will not become part of turnover to compute exemption of Rs. 10 Lac.
Text of Notification 33/2012-ST is as under and it clearly excludes exempted portion for computation of adhoc exemption of Rs. 10 Lac:
(B) “aggregate value” means the sum total of value of taxable services charged in the first consecutive invoices issued during a financial year but does not include value charged in invoices issued towards such services which are exempt from whole of service tax leviable thereon under section 66B of the said Finance Act under any other notification.”