I was a sophomore undergraduate at UCLA with a II-2 deferment. Student deferments were becoming more limited, so there was concern.
When the lottery was announced I started to make preliminary arrangements to go into a local Army Reserve unit as there was a 6 week training period followed by 1 weekend a month requirement. Also Reserves were not being sent overseas.
My lottery number came up 312 which was a relief. After discussing things with the campus draft advisor I took I-A status based on the likelihood they wouldn’t draft that high. It was good advice since the next year I was classified I-AS which meant they would have to go through all 366 numbers for the 1970 lottery and another 311 to get to me.
Boring perhaps, but safe, and no interruption in my education.