confusion about SSC CGL

more than 30000 candidates were selected after SSC Tier 2 but only 15000 candidates got the job. what is the procedure after Tier2 exam. please help , i am very confused

more than 30000 candidates were selected after SSC Tier 2 but only 15000 candidates got the job. what is the procedure after Tier2 exam. please help , i am very confused

Could anybody tell in which post of ssc cgl grade b work presure is low?