Frequently Answer Questions

Essential Series:

• Progressive practices to ensure mastery of core topics.
• Ideal for students who need additional support in grasping key math concepts.
• Encourages step-by-step learning.

Conquer Series:

• Focuses on heuristic-based and non-routine problem-solving questions.
• Includes challenging problems to promote critical and creative thinking.
• Ideal for students who have mastered core topics and want to excel.

• Targeted Questions: Focus on areas where students struggle, helping them to identify and overcome gaps in understanding. 

• Step-by-Step Explanation: Problems are broken down into manageable steps, demonstrating logical progression and ensuring clarity.

• Mistake Analysis: Examples of incorrect approaches are highlighted, with detailed explanation of why they are wrong and how to perform them correctly.

• Structured Frameworks: Emphasis on structured problem-solving techniques, model drawing and steps to answer the question accurately.

Delivery Fee

Delivery fee costs SGD $3.99

You will enjoy free delivery with a minimum spend of SGD$50.

Duration
Your order will be courier within 7 working days (excluding weekends & public holiday), between 9am to 9pm.

Self-Collection
We do not offer self-collection.

Do you ship outside of Singapore?

Yes, you can place your order with our partner Open School Bag at https://www.openschoolbag.com.sg/seller/onsponge

We accept Paypal, Debit or Credit Card

All books sold are non-refundable/ non-exchangeable. 

Title Changes After Purchase
Please note that once an order is completed, titles cannot be changed or switched.
This is to ensure accurate processing and inventory management

We kindly ask that all customers double-check selected titles before completing their purchase.

We do not accept product return or exchange unless they are due to wrong/damaged item delivered. 

Please note that you need to notify us within 3 days after you receive your order if your item(s) are found to be wrong/damaged.

Should you receive any items that:

• You did not order
• Are damaged or defective
• Wrong item

Please email in to onbooks@onsponge.com and provide us with the details of your order: 

• Your order number
• Date you received the book/s
• Title of the book/s
• Photos of the book/s, clearly showing the damage or defect

Where to download answer sheets? 

You may find the solutions under the tab ‘Downloadable Solutions’.

Do I need an account to purchase?

You may view your past purchases and save time from re-entering your billing information by logging into your account.

How to create an account?

You may create the account before you make purchase.
On the top right-hand corner of the page, please click the ‘Account’ logo, beside the shopping cart.

Otherwise, at the checkout page, you will be prompted to set your account username and password.

On your next purchase, you may login with your e-mail address and password

What to do if I forgot my password to my account? 

On the top right-hand corner of the page, please click the ‘Account’ logo, beside the shopping cart.

Click on ‘Lost your password?’, below the ‘Log In’ button.

Follow the instructions thereafter to reset your password.

For bulk purchase orders, please write in to osbooks@onsponge.com.