We answered your question about your T4A (OAS) and line 43700 in another thread. Here is the answer we gave you:

On T4A (OAS) Box 22, is Income tax deducted. this amount needs to be entered on line 43700. Box 18 is taxable pension paid and should be entered on line 11300.

For line 42200 Social benefits repayment, as per CRA, if you received old age security (OAS) pension during the year, you may have to repay all or part of your social benefits. Enter on line 42200 of your return the social benefits repayment amount from line 23500.

Line 23500 – Social benefits repayment

We recommend you contact CRA for more information about this repayment.

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