Try using a dummy select, something like this inside your SP to allow the application to grok the table definition it is expecting
CREATE PROCEDURE [dbo].[Get_Ques_id_for_can]
(@candidate_id varchar(max),@Exam_id varchar(max),@sec_id bigint,@Q_id varchar(max) OUTPUT)
AS
-- dummy select will never execute, but will let your application know what structure to expect
IF 1=2
SELECT CAST('' AS VARCHAR(50)) as [ID],CAST('' AS VARCHAR(50)) as [Question_ID]
declare @table_query varchar(max)
declare @table varchar(max)
set @table=@candidate_ID+@Exam_id
declare @id varchar(50)
declare @ques_id varchar(50)
set @table_query='SELECT [ID], [Question_ID] FROM ['+@table+'] WHERE [Section_ID]='+CONVERT(varchar(50),@sec_id)
EXEC(@table_query)
MM
select geometry::STGeomFromWKB(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