Consider the following about State Energy Efficiency Index 2023:

1. The index was launched by the Bureau of Energy Efficiency (BEE), in association with Alliance for an Energy Efficient Economy (AEEE), to evaluate the annual progress of energy efficiency implementation in the states. 

2. The top-performing states in each group are Karnataka (Group 1), Andhra Pradesh (Group 2), Assam (Group 3), and Chandigarh (Group 4). 

3. Maharashtra and Haryana have witnessed the most substantial improvements, with score increases of 18.5 and 17 points, respectively. 

How many of the above statements is/are correct?