Friends Plancess is best computer based educational service. I personally used plancess's video lecture & I scored well in jee main as well as wbjee engineering. The way plancess's exparts teach is really helpfull. If you are a jee or neet aspirant, you must go with plancess. Plancess's experts are from top IITs like IIT bombay, IIT Khraghpur, IIT delhi etc. Their suggestion are very useful and practical for jee. Plancess's study materials are also good. The best thing is their study materials not only give you question and answer but also previous years solved problems and they tell you most important problems. So olease try it.