Each of the 5 subjects it carries 200 marks and 5o marks for 4 practicals ,so the sum total is 1200 and accordingly the marks are divided respective of the subjects you opted.

For example English,Hindi,physics chemistry,biology 200 each.

And then for practicals,it may be computer, physics, chemistry, biology.

Hello Athira,
For plus two 
English,Tamil,maths,physics,chemistry each 200
If biology group biology will be 200.   (Or)
If computer science group computer science will be 200
For phy,Che,biology and computer science you will be 50 mark for practical each
All this sums to 1200

Language paper may change instead of Tamil u can have any language that is provided by institution it may include Hindi,French,German,urdu