Hi,

There is nothing mandatory for you to choose in 11th standard. For example, if you want to pursue medical then you need to choose Physics, Chemistry & Biology in 11th & if you wish to study in engineering field then Physics, Chemistry & Maths is compulsory so it depends on the course you want to take in the future other than that it does not matter which subject you choose. If you wish to study agricultural science in future then you may choose crop science or if you wish to pursue a career in fishery then you can take up fishery. There's no hard & fast rule as to what you should choose. Choose whichever you feel you will do well & whichever you enjoy studying.

Hope this helps.