There are various examinations conducted by UPSC every year like
Civil Services Exam
Indian Engineering Services
Special Recruitment Drives
Assistant Commandant in CRPF, BSF, SSB, ITBP & CISF
UPSC is Union Public Service Commission. Normally It conducts examination for class I posts in central government. Like Assistant Commandant, Direct Recruitment for Professor, staff officers, scientists, engineers etc.
Most of all the most prestigious examination that is Civil Services IAS/IPS/IFS/IRS etc.
Officers in defence forces through NDA/CDSE etc.