Dear seniors and members i have an educational background in forestry and i am about to appear in CE - 2016. i cannot decide among few subjects.

my optional subjects are
1. computer science . as i am not into political science or ir or physics etc.
2. statistics
3. geography

the problem lies below.
geology / usa history / british history / indo pak history or any of group three i.e public add, governance or town management?
agriculture & forestry/ Environmental Sciences / Criminology /Philosophy ?