Certificate

AWS certificate does not help you out in getting admission in MCA lateral entry as each college/university has it own norms for admission to MCA lateral entry.

B.Sc in animation and visual effects is complete degree so it won't be possible that you get only the VFX certificate. You can go for a certification course in VFX if you do not plan to go for a degree.

You can join the course with course completion certificate. Also within 1 or 2 months, you have to submit the full documents for verification. So, join with all the certificates in hand.

Assuming you are able to clear at least one paper per diet, maximum duration one can take to clear all papers is 7.5 years to becoming full qualified actuary. This is also an approximation to average time taken to become full qualified actuary. It is very normal that you may take more than one attempt for few papers while there are also few easy papers which you can give along with another paper.
All the best.