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4 months are enough for CSS preparation?

Dear All,
Assalam-o-alakikum,

I have a short query. Do you all think that 4 months are enough for CSS-2019 preparation? My optional subjects are as follows and also please suggest me to which optional subjects should i choose by keeping 4 months in eye?
Do you think these opt subjects are okay?
1. International Relations
2. Town Planning and Urban Management
3. History of Pakistan and India
4. Gender Studies or Environmental Studies
5. International Law or Muslim Law and Jurisprudence
Thanks to all.