Microsoft Certifications

ISTQB is the testing certification which you can pursue. There are several levels in it. At this stage, you can easily clear the level 1 of ISTQB.
All the best.

Microsoft has a lot of courses and resources online. Checkout Microsoft's Virtual Academy (MVA). You can do free courses from them. In order to give certification exams, you need to find a Microsoft test center or vendor near you and get more details. But, if you are planning to learn online then start with MVA.

Certifications are mostly independent from the graduation you do. So, you can go ahead and do Microsoft certifications of your choice. All the best.

Having a certification will add value to your profile and will let the recruiter know that you are skilled and were capable enough to clear MCSE certification. But, a graduation is must. You might get job in some startup or small company, but in order to grow in life, you will need a graduate degree. Graduation is primary, Certifications are secondary add-ons. So, complete your graduation. All the best!

It all depends on your job role and career aspirations. If you are working on Microsoft technology, then obviously you must focus on Microsoft Certifications. To start with, you need to start with a single certification at a time. You cannot sail in multiple boats simultaneously. If you want to go for Cisco path then start preparing for CCNA and don't get distracted. First become expert in one domain and then when you are expert in one domain then exploring multiple domains.
All the best.

Government exams and the IT certifications you mentioned are different things. Understand the fact that government exams are aptitude based. You will have to prepare Maths, English and reasoning.
If you are preparing for government exams and in your spare time you think of doing these certifications then go for it. But, if you think that your certifications will help you in exams then it's a wrong notion.
Yes, you can go for government exams till the time you are eligible for them.

On the basis of experience, you can make a switch. If you want to switch from BPO industry to other industries, then it will be a bit difficult but it's possible. Starting as a software developer would not be recommended as you have already worked in industry for 6 years. You can do project management (PMP) certification and get into management. You can also look out for executive MBA programs. All the best.

Best MCSE certificate are:
*Microsoft Certified Solutions Expert (MCSE)
*Red Hat: RHCSA and RHCE. *Linux Professional Institute (LPI): LPIC System Administrator. *CompTIA Server+
*VMware Certified Professional Data Center Virtualization (VCP-DCV)
*Service Now Certified System Administrator.

It is the link to the page that will provide you with required info.
https://www.shiksha.com/it-software/course/amp/mcts-microsoft-certified-technical-specialist-athais-infotech-franchise-of-iiht-mulund-east-mumbai-178165