Option 1 (Encouraging and supportive):
"I've noticed a real improvement in your work lately, and I'm incredibly proud of the effort you're putting in. Keep up the great work! Is there anything I can do to help you continue on this path?"
Option 2 (Acknowledging the change):
"It's fantastic to see such a positive change in your classroom performance. You're clearly dedicated now, and it's really paying off. What helped you make this shift?" (This opens a dialogue and allows the student to reflect on their progress.)
Option 3 (Focusing on specific improvements):
"Your participation in class has been amazing recently, and I especially noticed the improvement in your [specific subject/assignment]. This shows how much you're capable of when you put your mind to it. Keep it up!"
Option 4 (More formal, for a teacher):
"I've seen significant progress in your academic performance. Your dedication is commendable. Let's continue to work together to build on this success."
The key is to be genuine, positive, and supportive. Avoid language that implies past negativity unless it's necessary for a specific conversation about addressing previous challenges. Focus on the positive change and encourage the student to continue their efforts.