SA stream - (For class XI students) : Students who are studying class XI in the current academic year.
2) SX stream - (For class XII students) : Students who are studying class XII in current academic year .

3) SB stream - (For BSc 1st year students) : Students who are studying BSc 1st year in the current academic year should apply through this stream.

For further information you can go through with given below link.

KVPY

Good Luck!