Summary: Class24 adds Test Series for SSC, Railway

Why It Matters: This change shows Class24 is adding more ways for students to practice for exams.

What Changed:

• "Live Test" link was removed.
• "Test Series" link was added.
• New sub-links for "SSC" and "Railway" test series were added under "Test Series".
• A login/signup prompt was added.
• Contact information was added.
• Copyright information for "OTSAdda Privated Limited" was added.