Help please! Is chemotherapy the best way to treat cancer?

Depends . There are thousands of different types of cancer, each with different patterns of response to radiation and the many chemotherapeutic agents available at different stages. Hodgkin's, embryonal cell carcinoma, childhood leukemia, wilms tumor, and neuroblastoma are all cured more often than not by chemo. There are other cancers it doesn't touch, or for which it may be overused.