Hi Bairy Medhasvee. , 

the following are competitive exmas after class 12th.

Pcm: 

Engineering

• JEE(maims&advice) 
  
• KVPY
• CET
• BITSAT
• Comed-k
• Amu
• Mh cet
• Other state entrances

PCB.: 

• NEET
• AIIMS
• JIPMER
• STATE LEVEL CET'S
• KVPY
• CMS VELLORE
• MANIPAL
• 
  

Defence: 

• IMUCET
• Indian Navy b.Tech entry scheme
• INSR
• Indian Army TES
• NDA&NA

These are some important domains. 

Please comment if you want details of any other domain. 

Thankyou.