Hello sir how are you I am fine and it is very good your teacher and I feel very nice to use it and I solve all these exercises in 18 nothing to worry in maths sir it is very nice but please you take any other App for science also please sir I have a request for you and my friends and our school teachers also requested to teach you app that please you record your videos in the science episode so please sir if you don't mind then please you try to make video on science answer because many students are just like in maths they have problems in science answer so if you have them then you will be first in the educational centre of the world and I wish you very good luck for your next advantages of