Csas doubt (specific for ISC students)

Jinka board cbse nahi hai vo apne marks kese daale kyuki practical or theory ka breakdown nahi pata chalta in ISC

Board roll number me uid daalni hai ya index number? Index number hota hai mostly roll number ki tarah use but sab jagah uid daalni padti hai

This is a general question but ye kitne din Tak chalega like first round me agar mujhe college milgya to konsi date Tak hoga vo?