To address your query regarding the ICAI Centralized Distribution System (CDS) portal, here is the information you need:
Regarding "Coming Soon" Books
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Availability: When a book is marked as "Coming Soon" or is out of stock, it is temporarily removed from the portal until the inventory is replenished or the new edition is released.
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Strategy: It is generally recommended to wait until the full set of books is available if you want to use your coupon to cover the cost of both the books and the shipping. If you place an order now for the currently available books, you will "exhaust" that coupon/allotment.
Regarding Coupon Usage
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One-Time Use per Coupon: Once a coupon is redeemed and an order is placed, it is considered used. You cannot reuse the same coupon.
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Exhaustion Policy: Each course level (Foundation, Intermediate, Final) has a specific number of coupons allotted based on your registration. Once your allotted coupons are exhausted, you will have to purchase any remaining or updated materials by paying for the books themselves, along with the applicable courier charges.
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Recommendation: Because coupons are limited, it is highly advisable to order the complete set of study material for a specific group in a single transaction.
Summary for your situation:
If you place an order for only three books now, you will likely be using one of your allotted coupons. If you need to order the "6D" book later, you will not be able to use that same coupon again. Since you cannot "split" the coupon use for the same set, you should either wait until all required books are in stock to order them together or be prepared to pay for the "6D" book (and shipping) out of pocket later.
Summary: You cannot reuse a coupon once it has been redeemed. To avoid paying extra courier charges, it is recommended to wait until all your required books are available on the portal so you can order them as a complete set in one transaction. If you order now, your coupon will be exhausted, and any subsequent orders will require you to pay for both the books and shipping.