Sir, how may i thank you for this work you have created. I wish khan academy best for future. But sir please add  mechanical engineering subjects also and exams like GATE, PSUs for freshers and 2nd to 4th year students. It takes a lot time to cover this subjects please do it as soon as possible. There are other people i think would love to get this stream. And provide us access to the inspirations to crack these exams. I am a learner now. But i would love to donate for this Nobel cause. There many private universities who are getting admissions to fill seats but no seats are enough in government.universities. And applicants are more than that. I feel it as the hub for business but a downfall of careers. This is the only way that we may help each other like this to excel in our respective colleges to avoid the frustration after passing college out.

We are in economy and faith crisis the humanity. May god heal the world. If we want change then we will ave to do it ourselves.