Hi Rohan, you can refer the syllabus by reading this page.
No, Signature of the Principle is not necessary on the application form.
You have to apply for the exam before the given last date of the application form. Now you cannot apply for the AP EAMCET examination. you will be able to apply for the next time.
No, the attested photograph is not necessary on the EAMCET Application Form. Yes, You can take any gazetted officer's signature as attestation.