Hello,

You are pursuing diploma in electrical engineering. Which is very good subject. You can also go for higher study. Like you can entry as a lateral candidate in any engineering college. Infact if you go for job after completing this course you can get so many opportunities like

1. electricals.
2. fresher instrumentation.
3. service engineer.
4. electronics.
5. installation / commissioning.
6. plc - scada programming.
7. industrial instrumentation.
8. embedded systems.

The syllabus of TCS for job interview are verbal ability, logical reasoning, numerical ability, grammar. You can be prepared for those things. It's required for 1st round. Actually every company have different different round like any company have only 2 round or any company have 3 round. So you know from the job requirements notice that how many rounds are there and what are they. Just prepare for some basic knowledge it's important for technical round. And HR round check your presence of mind.

All the best.