No, you do NOT need to have 100 on 1a to get 100 on 1b. In fact, even if you got a zero on 1a you could still get 100 on 1b if you do all of 1b correctly.
NOTE: Your ability to do 2b correctly depends a lot on doing 2a correctly. Same for 3b and 3a. So for 2a and 3a, try to get everything right, for sure, ok?
No, you do NOT need to have 100 on 1a to get 100 on 1b. In fact, even if you got a zero on 1a you could still get 100 on 1b if you do all of 1b correctly.
NOTE: Your ability to do 2b correctly depends a lot on doing 2a correctly. Same for 3b and 3a. So for 2a and 3a, try to get everything right, for sure, ok?