Another site:
AllTop 200 most popular tests to learn English...
1) Test de niveau anglais (webmaster) 6 779 978
2) Placement test : grammar for beginners (anonyme) 5 994 699
3) A/AN (webmaster) 5 367 171
4) Auxiliary BE (webmaster) 3 225 203
5) Present continuous (webmaster) 3 000 279
6) Present simple (webmaster) 2 917 393
7) Present simple (webmaster) 2 598 542
8) Present continuous (webmaster) 2 436 245
9) Adjectives (webmaster) 2 094 171
10) A/an (anonyme) 2 016 374
11) Present perfect simple (webmaster) 1 645 102
12) Preterite (webmaster) 1 630 268
13) Vocabulary - Placement test (bridg) 1 619 687
14) Preterite (webmaster) 1 449 047
15) Short placement test (webmaster) 1 444 063
16) To be (bridg) 1 406 841
17) What time is it? (webmaster) 1 349 968
18) Present perfect (webmaster) 1 347 526
19) The alphabet in English (webmaster) 1 321 670
20) Adjectives (anonyme) 1 216 470
21) What time is it? (webmaster) 1 209 350
22) Numbers (webmaster) 1 188 942
23) 'A' ou 'An' (anonyme) 1 176 326
24) Two presents: present continuous, present simple (webmaster) 1 150 041
25) To be (bridg) 1 146 027
26) Comparatives / Superlatives (webmaster) 1 105 594
27) Numbers (webmaster) 1 071 243
28) CAN / MUST (webmaster) 1 059 054
29) THE/ A / AN / nothing (webmaster) 1 034 463
30) Comparatives (webmaster) 1 007 642
31) Family life (bridg) 1 001 305
32) Numbers > 100 (webmaster) 986 847
33) Future (going to/will/present continuous) (anonyme) 964 682
34) Plural (webmaster) 956 197
35) Superlatives (webmaster) 875 697
36) Adjectives (anonyme) 875 207
37) Simple present (bridg) 854 393
38) Spelled words N°1 (bridg) 850 570
39) Placement test beginners: Check your spelling (anonyme) 830 280
40) Introducing oneself (webmaster) 827 456
41) Adverbs of frequency (anonyme) 818 109
42) Family (bridg) 785 159
43) General test-End of high school / Beginning of university (webmaster) 783 162
44) Present simple (anonyme) 781 634
45) Frequency adverbs (webmaster) 778 100
46) Present BE + Ving (bridg) 765 577
47) Passive form (anonyme) 724 236
48) Genitive (webmaster) 723 998
49) Family tree (anonyme) 719 724
50) Preterite: simple or continuous? (webmaster) 717 236
51) Placement test (beginners) (lili73) 701 550
52) Past simple or present perfect (anonyme) 694 872
53) Future (webmaster) 676 218
54) 2 Preterites (webmaster) 662 556
55) Present perfect simple (bridg) 662 181
56) Preterite (webmaster) 620 957
57) List of 200 irregular verbs and audio (bridg) 616 453
58) Modals (webmaster) 613 022
59) Spelled words N°2 (bridg) 609 509
60) Height (webmaster) 606 592
61) Modals (webmaster) 606 223
62) Articles a / an / the (anonyme) 596 766
63) Plural forms (bridg) 577 825
64) Nationalities (webmaster) 574 554
65) Past continuous / Past simple (anonyme) 567 185
66) Irregular plurals (bridg) 553 971
67) Two presents: simple and continuous (webmaster) 549 944
68) Preterite (bridg) 549 327
69) Superlatives (frapedur) 539 741
70) Vocabulary: greeting people (here4u) 536 508
71) Give your opinion (bridg) 532 293
72) Adverbs of Frequency (bridg) 517 232
73) Present simple or continuous (anonyme) 511 874
74) Present perfect / preterite ? (anonyme) 510 282
75) Possessive case (anonyme) 480 925
76) Countries & nationalities (bridg) 473 788
77) 'The' or nothing? (webmaster) 471 426
78) Past tenses (bridg) 471 259
79) Introducing oneself (easy) (webmaster) 470 911
80) Passive voice (webmaster) 463 882
81) Present Simple vs. Past Simple (anonyme) 458 228
82) Questions : how to ask them (anonyme) 448 666
83) General Test II / End of high school / Beginning of universi (webmaster) 446 330
84) IN, ON, AT or TO? (webmaster) 445 616
85) Relative pronouns (webmaster) 444 821
86) Comparative of superiority (anonyme) 439 061
87) How to pronounce the final -ED? (past simple) (webmaster) 438 280
88) Relative clauses (webmaster) 423 640
89) Sounds: [h] (webmaster) 419 662
90) Comparative (anonyme) 414 098
91) A/an/Ø (bridg) 399 078
92) Past simple (anonyme) 398 090
93) Future simple (anonyme) 396 681
94) This / That / These / Those (webmaster) 392 738
95) Conditional (webmaster) 391 940
96) Passive voice (anonyme) 390 970
97) Comparing (webmaster) 388 210
98) Can / could/ may/ might (woodyrun) 379 905
99) Present perfect or past tense (anonyme) 377 832
100) Much, many, little and few (felin) 373 195
101) Personal pronouns (anonyme) 371 414
102) Preterite continuous (BE + -ING) (webmaster) 369 704
103) Genitive case (bridg) 368 377
104) Some, any, no, enough, too/too much/too many (webmaster) 368 364
105) Confusing words - Placement test (bridg) 364 616
106) Irregular verbs (webmaster) 363 805
107) Numbers from 1 to 10 (anonyme) 361 682
108) Past perfect simple, past perfect continuous (anonyme) 360 994
109) Present continuous or present simple (webmaster) 359 743
110) Present perfect or preterite? (anonyme) 357 249
111) Simple Past : regular verbs (anonyme) 353 452
112) Comparative Adjectives (bridg) 352 413
113) Who, Whom, Which, or Whose? (anonyme) 349 025
114) Past simple (video) (anonyme) 348 693
115) Past simple or past continuous (anonyme) 343 275
116) While / When (anonyme) 339 343
117) What time is it? (webmaster) 338 170
118) Modals (tinou) 336 719
119) Modal: may/might (anonyme) 334 330
120) Cardinal and ordinal numbers (anonyme) 328 886
121) The superlative (anonyme) 326 006
122) Possessive adjectives and pronouns (woodyrun) 324 517
123) How to talk about the weather (lili73) 320 914
124) Since and for (anonyme) 319 039
125) Flags (webmaster) 317 732
126) Irregular verbs (bridg) 316 181
127) Prepositions - in, on, at (anonyme) 314 222
128) Pronouns (woodyrun) 313 998
129) Tenses (anonyme) 312 201
130) Placement test 3 (webmaster) 310 687
131) Order of adjectives (webmaster) 306 703
132) Could/Couldn't (laure95) 306 043
133) Comparative (anonyme) 304 843
134) Agreement Tags (webmaster) 304 200
135) Adjectives and prepositions (anonyme) 304 141
136) Asking questions (webmaster) 303 325
137) Present perfect OR simple past? (bridg) 298 518
138) Questions in the past tense (anonyme) 297 713
139) Superlative Adjectives (bridg) 295 967
140) Uncountable nouns (webmaster) 295 913
141) Object pronouns (bridg) 295 172
142) Placement test 1 (anonyme) 292 945
143) Passive form (anonyme) 291 710
144) Present simple (anonyme) 291 483
145) Can/Must/Should (laure95) 289 868
146) Prefer/rather (bridg) 289 615
147) Past perfect (lili73) 288 608
148) Must or Have to? (woodyrun) 287 749
149) The/an/nothing (bridg) 285 403
150) To be (anonyme) 283 530
151) Can and can't (laure95) 281 855
152) Vocabulary: asking and answering (here4u) 280 461
153) Modal verbs (bridg) 277 383
154) Some / Any / no... (bridg) 273 670
155) Days of the week (bridg) 269 120
156) So / neither (anonyme) 264 419
157) Past simple (video) (anonyme) 263 838
158) Present continuous (chnawa) 260 661
159) Used to (bridg) 260 439
160) Should / must (anonyme) 259 846
161) Past tense (anonyme) 259 444
162) Vocabulary: on the phone (here4u) 258 779
163) Find out a quantity (webmaster) 258 627
164) Superlative + and adjective (anonyme) 257 375
165) Articles : a / an / the / Ø (anonyme) 257 189
166) Comparative and superlative (anonyme) 255 696
167) Numbers 1/100 (anonyme) 253 722
168) Modal can (video) (anonyme) 253 093
169) Comparatives (anonyme) 248 890
170) Relatives pronouns (who, which, that...) (anonyme) 247 850
171) Vocabulary: at the restaurant (here4u) 245 676
172) A few, a little, few, little (anonyme) 245 669
173) Would rather / would prefer to (anonyme) 244 470
174) Present continuous and the Going to form (anonyme) 242 792
175) Should/ have to/ must (anonyme) 240 162
176) Have something done (anonyme) 239 899
177) The past (webmaster) 237 898
178) Used to/would (woodyrun) 237 718
179) Future continuous and future perfect. (felin) 237 687
180) How to ask a question in English (bridg) 235 604
181) I wish, if only (felin) 234 121
182) Pluperfect (webmaster) 234 056
183) Countable or Uncountable? (webmaster) 233 293
184) Some / any (younes91) 233 041
185) Should / shouldn't (anonyme) 231 614
186) Present simple or continuous (bridg) 230 804
187) Adjectives - ing and ed (felin) 229 193
188) Hypothesis (webmaster) 228 317
189) Auxiliary BE (anonyme) 226 493
190) Articles a/an/the/0 (bridg) 226 356
191) Article The or nothing (anonyme) 226 050
192) Must or mustn't (laure95) 225 856
193) Present perfect with Ever - never - (anonyme) 225 666
194) Present continuous OR Present simple? (bridg) 225 558
195) Simple Preterite OR Preterite (BE+ing) (webmaster) 222 891
196) To / in order to / so as to / so that (irish21) 220 518
197) Present perfect (bridg) 219 553
198) Comparison (komiks) 219 350
199) What time is it ? (anonyme) 217 714
200) Indirect speech (bridg) 216 829
