I am a student of BCA (Bachelor of Computer Application) in Kolkata, India. Originally I am a Bangladeshi. I have a moderate collection of books which I downloaded for about 7 years. Among them, richer fields are Physics, Chemistry, Mathematics, Computer Programming, Computer Science, Scientific Books, Nobles, Lecture notes, Journals, Recent innovations etc. Now I feel its time to share these important books, as they were a great advantage to me, and now it might be useful to others as well. I passed O-Levels and A-Levels, with good results in Physics, Chemistry and Mathematics. So, I also want to share my school notes which may of great advantage to the school students, for I wrote them myself searching throughout many many books. This also can save time of the students to understand and they can more concentrate on the problems, and solve them. I am very much glad that I have the opportunity to share my documents, which can be helpful to others.