Advanced level chemistry physics science for technology /ordinary level mathematics science 2019,2020,2021 . Theory revision . Specially for those who have missed their lessons. Heat, waves, electronics, electricity, chemical calculations, , mechanics, light from very basics. 500 organic conversions will be solved by using 15 mind maps. Another 15 mind maps for industrial spd . Colombo, negombo, horana, kalutara, matara, galle, gampaha, kandy. Roshan0711230900

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