You might have noticed that the tax rate is not synced to TradeGecko despite having it set up when you created the Order.
The plugin derive the tax rate value from Tax rules. Unless you've done this, the tax rate per line item in your order would always be 0.
Setting Up Tax Rules
1. Navigate to WooCommerce > Settings
2. Select the Tax Rates that applies to you. In this case, Standard is chosen.
3. Click Insert row and add your tax. After you're done, click the Save changes button.
4. When you create an order, make sure that you click "+add tax row[?]" link in the Tax rows box and select the Tax Rate that you would be using.