If you already have access to maths, you can add English language to your membership for S$7/month or S$60/year. This price will be calculated pro rata if you upgrade in the middle of a billing cycle.

To update your plan: 

1. Sign in to your parent account from the IXL website. 
2. Open your account menu in the upper-right corner, and select Membership details. 
3. In the Membership information section, click add English language. 
4. Click Update to confirm.