Review comment updated

Merge pull request #7 from virtual-labs/testing

Testing

Migrated pretest and posttest questions from **".js"** format to **."json"** format and updated .yml file.

Migrated pretest and posttest questions from ".js" format to ."json" format and updated .yml file.

Bug Fixed 2

Merge pull request #5 from virtual-labs/testing

Update index.html

Implementing Method Overriding

Merge pull request #4 from virtual-labs/testing

Testing

Implementing Method Overriding

Merge pull request #3 from virtual-labs/testing

Testing