Operated for Astrocytoma Grade 3 left frontal brain tumor. Will go for radio nd chemo therapy in a few days. Which precautions/alternative can be taken?

Define your terms. Not clear what you mean by "precautions" or "alternatives." Precautions re XRT and chemo or for something else? The "alternative" to treatment is to do nothing; or to resort to traditional Indian medicine, which is the same as doing nothing, & don't let any well-meaning but ignorant laypeople or charlatans tell you different; unless all you're interested in is feeling better about dying.