Deustchemann:

Please note that your Waec alone is not sufficient to get you a bachelor's admission.

You have to go through any of the following processes:
1. Get a completed 100L Nigerian University transcript of a program similar to the one you want to study in Germany. You can enrol at NOUN for that. Together with your WAEC,it's good to go
2. Learn German up to B1 or B2 level and apply to studienkolleg.

However, I'd strongly recommend the first option.

Your age isn't a factor bro. People in their 30s are doing a bachelor degree there.

1. What would/should the minium score on the 100L transcript be?
2. Can I apply for Information Engineering all though I'm studying Material science and Engineering in 100L?

Thank you.