One of the best classes u wud say for engg and technical related study’s woud be vidyalankar no doubt cos it made me understand the concepts so well that now I can teach others...u wud be surprised the way they teach.
They make studies and difficult subjects very much easy man..i became seriously good in the studies..the think about vidyalankar classes is that they ony study practical subjects and they make you so good in practical subjects that you dont need to worry about studying it again!.
I love the way they teach and when you consider any classes do consider vidyalankar.