i am here on a visit visa same as u. when they stamp 3 months validity it means u should enter the country anytime within the 3 months. once here u get a month, 2 month what ever at the immigration counter. u now have to go get ur medical ie. xray & blood test done & get a visit visa renewal done, if that is what u want. if not do the medical & proceed with RP work. i have dont this process just a month back & am still on visit visa(renewed).