diff --git a/test_1/lecture1.pdf b/test_1/lecture1.pdf
new file mode 100644
index 0000000..5b6b3be
Binary files /dev/null and b/test_1/lecture1.pdf differ
diff --git a/test_1/lecture2.pdf b/test_1/lecture2.pdf
new file mode 100644
index 0000000..f9c4b9a
Binary files /dev/null and b/test_1/lecture2.pdf differ
diff --git a/test_1/lecture3_toc20.pdf b/test_1/lecture3_toc20.pdf
new file mode 100644
index 0000000..0a6aee7
Binary files /dev/null and b/test_1/lecture3_toc20.pdf differ
diff --git a/test_1/lecture4_toc2020.pdf b/test_1/lecture4_toc2020.pdf
new file mode 100644
index 0000000..ae3b20e
Binary files /dev/null and b/test_1/lecture4_toc2020.pdf differ
diff --git a/test_1/lecture5.pdf b/test_1/lecture5.pdf
new file mode 100644
index 0000000..1a2ae32
Binary files /dev/null and b/test_1/lecture5.pdf differ
diff --git a/test_1/lecture6_2020.pdf b/test_1/lecture6_2020.pdf
new file mode 100644
index 0000000..6814e16
Binary files /dev/null and b/test_1/lecture6_2020.pdf differ
diff --git a/test_1/math_session.pdf b/test_1/math_session.pdf
new file mode 100644
index 0000000..32e46b5
Binary files /dev/null and b/test_1/math_session.pdf differ