There are always room for improvements

It been 3 weeks i've been here in S.M.K Seri Hartamas. But every times i entered the class it still give me butterflies. This would be my main problem. There are always room for improvements - Madam Jeet (my mentor) Somehow she always give me positive comments and suggestions for what to do in class whenever i felt down and made me want to do better for the next class. I got form 2 Ikhlas which is very noisy and divided into few groups in class. They have high proficiency and low proficiency students and some like to talk Bahasa with me. Group works doesn't fit them as they always talk in groups and i unable to control the class told my mentor. They also have little respect for teacher. So I changed my method from being nice to strict. They still like to talk though but i will constantly remind them to be silent. My mentor also commented my teaching where i always concentrate the front row because they always answered my question and forgot about students sitting at the back and made them lost interest to learn. I've tried role play in group but only the high proficiency seem to participate. I still need to figure more methods for them that complements everyone in the class. While for my form 4 Zuhal they are very passive and somehow reminded me of my high school class. It is always the same person that answered all the questions i asked them. They don't like to do group work and if yes only the same person did all the tasks while others will chat or sleep. Because of this i will always ask people who sleep, chat and sitting at the back to answer questions or give their comments in class. Every comments and experiences i faced made me stronger and i'll to do it better next day. And feel free to comment if you have any suggestion or comment to help me. Aby <3