Credit hours kaise earn hote hain? Degree ke total credits ka kya scene ha?

Ye credits se kya hota hai? Mere credits kam show hore hain jab k total required zyada hain, or mera 3rd sem abhi clear hua hai. Agar 4 saal k sab subjects clear ho jaye to kia credit hours total required k equal hojate hain? Ya alag se kuch karna parta hai k sab clear ho par credit km ho? Degree k liye jitne total credit hours likhe hue wo earn karne honge, to ye kese earn hote hain, sare subjects clear kar k?