Cognitive Training vs Treatment as Usual ANOVA

Two group analysis comparing 10 subjects in each group who received cognitive training (CT) vs treatment as usual (TAU) using ANOVA. Both groups received the same pre and post neurocognitive test battery. We need to perform a between subjects analysis covarying for the baseline level of cognitive functioning. The hypothesis is that the CT group will show greater improvement on the cognitive battery compared TAU. Also, I would like to consider using a within subjects analysis on the CT group to determine the effect size of change.