Embibe's Study platform has covered all the concepts used in 11th and 12th for PCMB subjects. LEARN provides study materials, video lectures, important questions, etc. for around 15,000 concepts.
In case you are not able to find what you are looking for, try using a combination of related words. Several chapters are known by different names and hence there might be cases where you don't find the chapter you want. However, we assure you that all the chapters and concepts have been covered.
If you want us to include any concept in addition to what we currently have, kindly leave us an email at firstname.lastname@example.org. We will look into it and add it to our library.